Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,583,075	$ 1,831,791
Gross Unrealized Gains	12	20
Gross Unrealized Losses	194,577	236,844
Fair Value	1,388,510	1,594,967
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,220	190,170
Gross Unrealized Gains	0	0
Gross Unrealized Losses	6,926	22,919
Fair Value	107,294	167,251
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	491,968	681,192
Gross Unrealized Gains	10	0
Gross Unrealized Losses	32,037	80,025
Fair Value	459,941	601,167
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	90,154	93,599
Gross Unrealized Gains	2	8
Gross Unrealized Losses	12,919	8,326
Fair Value	77,237	85,281
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,263	58,727
Gross Unrealized Gains	0	12
Gross Unrealized Losses	6,864	6,071
Fair Value	45,399	52,668
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	831,970	805,603
Gross Unrealized Gains	0	0
Gross Unrealized Losses	135,661	119,381
Fair Value	696,309	686,222
U.S. corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,500	2,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	170	122
Fair Value	$ 2,330	$ 2,378