Investment Securities - Held to Maturity Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value
Less Than 12 Months	$ 5,756	$ 1,461
12 Months or Greater	380,859	385,894
Total	386,615	387,355
Gross Unrealized Losses
Less Than 12 Months	(41)	(78)
12 Months or Greater	(48,439)	(43,733)
Total	(48,480)	(43,811)
U.S. treasury securities
Fair Value
Less Than 12 Months	0	0
12 Months or Greater	89,733	90,094
Total	89,733	90,094
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Greater	(3,995)	(3,212)
Total	(3,995)	(3,212)
U.S. agency securities
Fair Value
Less Than 12 Months	0	0
12 Months or Greater	14,748	14,858
Total	14,748	14,858
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Greater	(1,502)	(1,424)
Total	(1,502)	(1,424)
State, county & municipal securities
Fair Value
Less Than 12 Months	5,756	1,461
12 Months or Greater	104,271	103,500
Total	110,027	104,961
Gross Unrealized Losses
Less Than 12 Months	(41)	(78)
12 Months or Greater	(14,686)	(13,781)
Total	(14,727)	(13,859)
Mortgage-backed securities
Fair Value
Less Than 12 Months	0	0
12 Months or Greater	172,107	177,442
Total	172,107	177,442
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Greater	(28,256)	(25,316)
Total	$ (28,256)	$ (25,316)