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Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 1,504,331	$ 1,516,841
Gross Unrealized Gains	3,828	5,424
Gross Unrealized Losses	(238,010)	(222,564)
Fair Value	1,270,149	1,299,701
U.S. Treasury and U.S. government sponsored entities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	137,720	145,439
Gross Unrealized Gains	12	113
Gross Unrealized Losses	(18,585)	(17,597)
Fair Value	119,147	127,955
State and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	612,030	644,880
Gross Unrealized Gains	3,555	4,792
Gross Unrealized Losses	(98,144)	(93,503)
Fair Value	517,441	556,169
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	18,670	18,554
Gross Unrealized Gains	146	187
Gross Unrealized Losses	(457)	(466)
Fair Value	18,359	18,275
Mortgage-backed securities - residential
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	627,338	624,529
Gross Unrealized Gains	15	1
Gross Unrealized Losses	(113,628)	(104,144)
Fair Value	513,725	520,386
Collateralized mortgage obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	105,510	80,227
Gross Unrealized Gains	100	331
Gross Unrealized Losses	(6,880)	(6,559)
Fair Value	98,730	73,999
Small Business Administration
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,063	3,212
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(316)	(295)
Fair Value	$ 2,747	$ 2,917

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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