Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Transfers out of Level 3			$ 0
Available-for-sale Securities
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3				$ 1
Recurring \| Other investments
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period	$ 199,420,000	$ 168,312,000	176,551,000	157,140,000
Total realized gains (losses) included in income	4,822,000	2,414,000	8,396,000	1,879,000
Changes in unrealized gains/losses included in other comprehensive income (loss)	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Purchases	12,879,000	5,608,000	37,501,000	22,910,000
Issuances	0	0	0	0
Settlements	(1,476,000)	(6,078,000)	(6,803,000)	(11,673,000)
Transfers out of Level 3	0	0	0	0
Fair value, end of period	215,645,000	170,256,000	215,645,000	170,256,000
Total net realized gains (losses) included in income	4,822,000	2,414,000	8,396,000	1,879,000
Recurring \| Available-for-sale Securities
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period	13,086,000	13,197,000	13,224,000	479,000
Total realized gains (losses) included in income	14,000	13,000	40,000	39,000
Changes in unrealized gains/losses included in other comprehensive income (loss)	0	2,000	2,000	18,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	12,841,000
Purchases	0	0	0	0
Issuances	0	0	0	0
Settlements	(173,000)	0	(339,000)	(165,000)
Transfers out of Level 3	0	0	0	0
Fair value, end of period	12,927,000	13,212,000	12,927,000	13,212,000
Total net realized gains (losses) included in income	14,000	13,000	40,000	39,000
Recurring \| Servicing Contracts
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period	10,903,000	11,301,000	11,854,000	0
Total realized gains (losses) included in income	(219,000)	(343,000)	(1,170,000)	10,958,000
Changes in unrealized gains/losses included in other comprehensive income (loss)	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair value, end of period	10,684,000	10,958,000	10,684,000	10,958,000
Total net realized gains (losses) included in income	$ (219,000)	$ (343,000)	$ (1,170,000)	$ 10,958,000

PINNACLE FINANCIAL PARTNERS INC 10-Q