Note 5 - Loans and Allowance for Loan Losses - Aging Analysis of Accruing and Non-Accruing Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Commercial:
Financing Receivable - PCI Loans	$ 2,426,087	$ 2,409,047	$ 2,409,047
Financing Receivable - Current	2,352,901	2,312,445
Loans receivable	2,426,087	2,409,047	2,409,047
Consumer:
Financing Receivable - PCI Loans	2,426,087	2,409,047	2,409,047
Financing Receivable - Current	2,352,901	2,312,445
Loans receivable	2,426,087	2,409,047	$ 2,409,047
Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	66,821	85,455
Loans receivable	66,821	85,455
Consumer:
Financing Receivable - PCI Loans	66,821	85,455
Loans receivable	66,821	85,455
Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	2,125	1,218
Consumer:
Financing Receivable Past Due	2,125	1,218
Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	977	2,981
Consumer:
Financing Receivable Past Due	977	2,981
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	3,263	6,948
Consumer:
Financing Receivable Past Due	3,263	6,948
Commercial Portfolio Segment [Member]
Commercial:
Financing Receivable - PCI Loans	1,898,706	1,893,762
Financing Receivable - Current	1,848,924	1,828,962
Loans receivable	1,898,706	1,893,762
Consumer:
Financing Receivable - PCI Loans	1,898,706	1,893,762
Financing Receivable - Current	1,848,924	1,828,962
Loans receivable	1,898,706	1,893,762
Commercial Portfolio Segment [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	46,661	60,057
Loans receivable	46,661	60,057
Consumer:
Financing Receivable - PCI Loans	46,661	60,057
Loans receivable	46,661	60,057
Commercial Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	996	756
Consumer:
Financing Receivable Past Due	996	756
Commercial Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	503	1,398
Consumer:
Financing Receivable Past Due	503	1,398
Commercial Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	1,622	2,589
Consumer:
Financing Receivable Past Due	1,622	2,589
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Commercial:
Financing Receivable - PCI Loans	411,233	387,401
Financing Receivable - Current	407,650	382,720
Loans receivable	411,233	387,401
Consumer:
Financing Receivable - PCI Loans	411,233	387,401
Financing Receivable - Current	407,650	382,720
Loans receivable	411,233	387,401
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	3,060	3,920
Loans receivable	3,060	3,920
Consumer:
Financing Receivable - PCI Loans	3,060	3,920
Loans receivable	3,060	3,920
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	28	587
Consumer:
Financing Receivable Past Due	28	587
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	17	7
Consumer:
Financing Receivable Past Due	17	7
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	478	167
Consumer:
Financing Receivable Past Due	478	167
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member]
Commercial:
Financing Receivable - PCI Loans	364,345	367,553
Financing Receivable - Current	352,711	351,767
Loans receivable	364,345	367,553
Consumer:
Financing Receivable - PCI Loans	364,345	367,553
Financing Receivable - Current	352,711	351,767
Loans receivable	364,345	367,553
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	10,205	15,401
Loans receivable	10,205	15,401
Consumer:
Financing Receivable - PCI Loans	10,205	15,401
Loans receivable	10,205	15,401
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	760	0
Consumer:
Financing Receivable Past Due	760	0
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	206	0
Consumer:
Financing Receivable Past Due	206	0
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	463	385
Consumer:
Financing Receivable Past Due	463	385
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member]
Commercial:
Financing Receivable - PCI Loans	769,405	743,107
Financing Receivable - Current	744,086	709,021
Loans receivable	769,405	743,107
Consumer:
Financing Receivable - PCI Loans	769,405	743,107
Financing Receivable - Current	744,086	709,021
Loans receivable	769,405	743,107
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	24,361	30,700
Loans receivable	24,361	30,700
Consumer:
Financing Receivable - PCI Loans	24,361	30,700
Loans receivable	24,361	30,700
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	208	169
Consumer:
Financing Receivable Past Due	208	169
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	280	1,391
Consumer:
Financing Receivable Past Due	280	1,391
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	470	1,826
Consumer:
Financing Receivable Past Due	470	1,826
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member]
Commercial:
Financing Receivable - PCI Loans	84,971	82,707
Financing Receivable - Current	84,971	82,707
Loans receivable	84,971	82,707
Consumer:
Financing Receivable - PCI Loans	84,971	82,707
Financing Receivable - Current	84,971	82,707
Loans receivable	84,971	82,707
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	0	0
Loans receivable	0	0
Consumer:
Financing Receivable - PCI Loans	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member]
Commercial:
Financing Receivable - PCI Loans	91,676	105,362
Financing Receivable - Current	84,512	97,288
Loans receivable	91,676	105,362
Consumer:
Financing Receivable - PCI Loans	91,676	105,362
Financing Receivable - Current	84,512	97,288
Loans receivable	91,676	105,362
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	7,164	8,074
Loans receivable	7,164	8,074
Consumer:
Financing Receivable - PCI Loans	7,164	8,074
Loans receivable	7,164	8,074
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member]
Commercial:
Financing Receivable - PCI Loans	161,810	194,732
Financing Receivable - Current	161,810	194,732
Loans receivable	161,810	194,732
Consumer:
Financing Receivable - PCI Loans	161,810	194,732
Financing Receivable - Current	161,810	194,732
Loans receivable	161,810	194,732
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	0	0
Loans receivable	0	0
Consumer:
Financing Receivable - PCI Loans	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| Other Commercial [Member]
Commercial:
Financing Receivable - PCI Loans	15,266	12,900
Financing Receivable - Current	13,184	10,727
Loans receivable	15,266	12,900
Consumer:
Financing Receivable - PCI Loans	15,266	12,900
Financing Receivable - Current	13,184	10,727
Loans receivable	15,266	12,900
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	1,871	1,962
Loans receivable	1,871	1,962
Consumer:
Financing Receivable - PCI Loans	1,871	1,962
Loans receivable	1,871	1,962
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	0
Consumer:
Financing Receivable Past Due	0	0
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	211	211
Consumer:
Financing Receivable Past Due	211	211
Consumer Portfolio Segment [Member]
Commercial:
Financing Receivable - PCI Loans	527,381	515,285
Financing Receivable - Current	503,977	483,483
Loans receivable	527,381	515,285
Consumer:
Financing Receivable - PCI Loans	527,381	515,285
Financing Receivable - Current	503,977	483,483
Loans receivable	527,381	515,285
Consumer Portfolio Segment [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	20,160	25,398
Loans receivable	20,160	25,398
Consumer:
Financing Receivable - PCI Loans	20,160	25,398
Loans receivable	20,160	25,398
Consumer Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	1,129	462
Consumer:
Financing Receivable Past Due	1,129	462
Consumer Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	474	1,583
Consumer:
Financing Receivable Past Due	474	1,583
Consumer Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	1,641	4,359
Consumer:
Financing Receivable Past Due	1,641	4,359
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member]
Commercial:
Financing Receivable - PCI Loans	287,596	260,521
Financing Receivable - Current	268,011	235,712
Loans receivable	287,596	260,521
Consumer:
Financing Receivable - PCI Loans	287,596	260,521
Financing Receivable - Current	268,011	235,712
Loans receivable	287,596	260,521
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	17,287	21,472
Loans receivable	17,287	21,472
Consumer:
Financing Receivable - PCI Loans	17,287	21,472
Loans receivable	17,287	21,472
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	1,054	328
Consumer:
Financing Receivable Past Due	1,054	328
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	40	69
Consumer:
Financing Receivable Past Due	40	69
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	1,204	2,940
Consumer:
Financing Receivable Past Due	1,204	2,940
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member]
Commercial:
Financing Receivable - PCI Loans	172,240	176,799
Financing Receivable - Current	170,547	173,569
Loans receivable	172,240	176,799
Consumer:
Financing Receivable - PCI Loans	172,240	176,799
Financing Receivable - Current	170,547	173,569
Loans receivable	172,240	176,799
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	1,005	1,088
Loans receivable	1,005	1,088
Consumer:
Financing Receivable - PCI Loans	1,005	1,088
Loans receivable	1,005	1,088
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	12	80
Consumer:
Financing Receivable Past Due	12	80
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	375	1,176
Consumer:
Financing Receivable Past Due	375	1,176
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	301	886
Consumer:
Financing Receivable Past Due	301	886
Consumer Portfolio Segment [Member] \| Residential Construction [Member]
Commercial:
Financing Receivable - PCI Loans	50,484	59,060
Financing Receivable - Current	48,902	55,738
Loans receivable	50,484	59,060
Consumer:
Financing Receivable - PCI Loans	50,484	59,060
Financing Receivable - Current	48,902	55,738
Loans receivable	50,484	59,060
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	1,522	2,470
Loans receivable	1,522	2,470
Consumer:
Financing Receivable - PCI Loans	1,522	2,470
Loans receivable	1,522	2,470
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due		8
Consumer:
Financing Receivable Past Due		8
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	0	335
Consumer:
Financing Receivable Past Due	0	335
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	60	509
Consumer:
Financing Receivable Past Due	60	509
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member]
Commercial:
Financing Receivable - PCI Loans	17,061	18,905
Financing Receivable - Current	16,517	18,464
Loans receivable	17,061	18,905
Consumer:
Financing Receivable - PCI Loans	17,061	18,905
Financing Receivable - Current	16,517	18,464
Loans receivable	17,061	18,905
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Receivables Acquired with Deteriorated Credit Quality [Member]
Commercial:
Financing Receivable - PCI Loans	346	368
Loans receivable	346	368
Consumer:
Financing Receivable - PCI Loans	346	368
Loans receivable	346	368
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	63	46
Consumer:
Financing Receivable Past Due	63	46
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	59	3
Consumer:
Financing Receivable Past Due	59	3
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Financing Receivable Past Due	76	24
Consumer:
Financing Receivable Past Due	$ 76	$ 24

Park Sterling Corp 10-Q