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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 9,113	$ 3,794	$ 37,993
Unrealized Losses (Less than 12 months)	(46)	(63)	(1,205)
Fair Value (Estimated) (12 months or more)	251,590	257,711	245,361
Unrealized Losses (12 months or more)	(54,270)	(50,342)	(50,192)
Fair Value (Estimated)	260,703	261,505	283,354
Unrealized Losses	(54,316)	(50,405)	(51,397)
U.S. Treasury & Agency securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	0	0
Unrealized Losses (Less than 12 months)	0	0	0
Fair Value (Estimated) (12 months or more)	19,693	19,830	19,518
Unrealized Losses (12 months or more)	(6,343)	(6,203)	(6,509)
Fair Value (Estimated)	19,693	19,830	19,518
Unrealized Losses	(6,343)	(6,203)	(6,509)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	4,593	1,712	29,453
Unrealized Losses (Less than 12 months)	(16)	(14)	(1,075)
Fair Value (Estimated) (12 months or more)	202,736	208,717	199,483
Unrealized Losses (12 months or more)	(41,619)	(38,477)	(37,636)
Fair Value (Estimated)	207,329	210,429	228,936
Unrealized Losses	(41,635)	(38,491)	(38,711)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	4,520	2,082	8,540
Unrealized Losses (Less than 12 months)	(30)	(49)	(130)
Fair Value (Estimated) (12 months or more)	29,161	27,700	23,076
Unrealized Losses (12 months or more)	(6,308)	(5,653)	(5,984)
Fair Value (Estimated)	33,681	29,782	31,616
Unrealized Losses	$ (6,338)	(5,702)	(6,114)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)		0	0
Unrealized Losses (Less than 12 months)		0	0
Fair Value (Estimated) (12 months or more)		1,464	3,284
Unrealized Losses (12 months or more)		(9)	(63)
Fair Value (Estimated)		1,464	3,284
Unrealized Losses		$ (9)	$ (63)

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