Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 3,794	$ 251,182
Unrealized Losses (Less than 12 months)	(63)	(23,126)
Fair Value (Estimated) (12 months or more)	257,711	310,159
Unrealized Losses (12 months or more)	(50,342)	(88,620)
Fair Value (Estimated)	261,505	561,341
Unrealized Losses	(50,405)	(111,746)
U.S. Treasury & Agency securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	4,804
Unrealized Losses (Less than 12 months)	0	(675)
Fair Value (Estimated) (12 months or more)	19,830	41,965
Unrealized Losses (12 months or more)	(6,203)	(16,680)
Fair Value (Estimated)	19,830	46,769
Unrealized Losses	(6,203)	(17,355)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	1,712	73,509
Unrealized Losses (Less than 12 months)	(14)	(6,486)
Fair Value (Estimated) (12 months or more)	208,717	197,102
Unrealized Losses (12 months or more)	(38,477)	(47,353)
Fair Value (Estimated)	210,429	270,611
Unrealized Losses	(38,491)	(53,839)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	2,082	149,517
Unrealized Losses (Less than 12 months)	(49)	(13,769)
Fair Value (Estimated) (12 months or more)	27,700	67,932
Unrealized Losses (12 months or more)	(5,653)	(24,247)
Fair Value (Estimated)	29,782	217,449
Unrealized Losses	(5,702)	(38,016)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	3,495
Unrealized Losses (Less than 12 months)	0	(53)
Fair Value (Estimated) (12 months or more)	1,464	0
Unrealized Losses (12 months or more)	(9)	0
Fair Value (Estimated)	1,464	3,495
Unrealized Losses	$ (9)	(53)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)		19,857
Unrealized Losses (Less than 12 months)		(2,143)
Fair Value (Estimated) (12 months or more)		3,160
Unrealized Losses (12 months or more)		(340)
Fair Value (Estimated)		23,017
Unrealized Losses		$ (2,483)