PORTFOLIO LOANS (Details 5) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	$ 526	$ 502
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	8,074	8,098
Allowance for portfolio loan losses, Total Ending Balance	8,600	8,600	$ 8,272	$ 8,162
Portfolio loans, Individually Evaluated for Impairment	7,770	7,805
Portfolio loans, Collectively Evaluated for Impairment	752,031	751,886
Portfolio loans, Total Ending Balance	759,801	759,691
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	65	74
Allowance for portfolio loan losses, Total Ending Balance	65	74	46	212
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	4	4
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	5,958	5,998
Allowance for portfolio loan losses, Total Ending Balance	5,962	6,002	5,954	5,774
Portfolio loans, Individually Evaluated for Impairment	6,800	6,829
Portfolio loans, Collectively Evaluated for Impairment	584,454	579,303
Portfolio loans, Total Ending Balance	591,254	586,132
Real Estate Loans [Member] \| One to Four Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	2,714	2,684
Allowance for portfolio loan losses, Total Ending Balance	2,714	2,684	2,911	3,090
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	283,194	286,671
Portfolio loans, Total Ending Balance	283,194	286,671
Real Estate Loans [Member] \| Multi Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	169	170
Allowance for portfolio loan losses, Total Ending Balance	169	170	295	268
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	65,043	65,419
Portfolio loans, Total Ending Balance	65,043	65,419
Real Estate Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	4	4
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	2,877	2,985
Allowance for portfolio loan losses, Total Ending Balance	2,881	2,989	2,551	2,209
Portfolio loans, Individually Evaluated for Impairment	1,290	1,319
Portfolio loans, Collectively Evaluated for Impairment	225,136	218,963
Portfolio loans, Total Ending Balance	226,426	220,282
Real Estate Loans [Member] \| Land Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	198	159
Allowance for portfolio loan losses, Total Ending Balance	198	159	197	207
Portfolio loans, Individually Evaluated for Impairment	5,510	5,510
Portfolio loans, Collectively Evaluated for Impairment	11,081	8,250
Portfolio loans, Total Ending Balance	16,591	13,760
Real Estate Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	250	233
Allowance for portfolio loan losses, Total Ending Balance	250	233	253	279
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	25,238	25,888
Portfolio loans, Total Ending Balance	25,238	25,888
Real Estate Construction Loans [Member] \| One to Four Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	53	55
Allowance for portfolio loan losses, Total Ending Balance	53	55	160	159
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	8,297	8,579
Portfolio loans, Total Ending Balance	8,297	8,579
Real Estate Construction Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	197	178
Allowance for portfolio loan losses, Total Ending Balance	197	178	93	120
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	16,941	17,309
Portfolio loans, Total Ending Balance	16,941	17,309
Real Estate Construction Loans [Member] \| Acquisition and Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Total Ending Balance	0	0	0	0
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	0	0
Portfolio loans, Total Ending Balance	0	0
Other Portfolio Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	522	498
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	1,801	1,793
Allowance for portfolio loan losses, Total Ending Balance	2,323	2,291	2,019	1,897
Portfolio loans, Individually Evaluated for Impairment	970	976
Portfolio loans, Collectively Evaluated for Impairment	142,339	146,695
Portfolio loans, Total Ending Balance	143,309	147,671
Other Portfolio Loans [Member] \| Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	613	604
Allowance for portfolio loan losses, Total Ending Balance	613	604	574	560
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	33,647	34,477
Portfolio loans, Total Ending Balance	33,647	34,477
Other Portfolio Loans [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	0	0
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	338	345
Allowance for portfolio loan losses, Total Ending Balance	338	345	386	457
Portfolio loans, Individually Evaluated for Impairment	0	0
Portfolio loans, Collectively Evaluated for Impairment	33,222	34,743
Portfolio loans, Total Ending Balance	33,222	34,743
Other Portfolio Loans [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for portfolio loan losses, Individually Evaluated for Impairment	522	498
Allowance for portfolio loan losses, Collectively Evaluated for Impairment	850	844
Allowance for portfolio loan losses, Total Ending Balance	1,372	1,342	$ 1,059	$ 880
Portfolio loans, Individually Evaluated for Impairment	970	976
Portfolio loans, Collectively Evaluated for Impairment	75,470	77,475
Portfolio loans, Total Ending Balance	$ 76,440	$ 78,451

Atlantic Coast Financial CORP 10-Q