Investment Securities - Held to Maturity Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value
Less Than 12 Months	$ 3,286	$ 23,438
12 Months or Greater	399,599	386,766
Total	402,885	410,204
Gross Unrealized Losses
Less Than 12 Months	(47)	(2,121)
12 Months or Greater	(44,985)	(52,505)
Total	(45,032)	(54,626)
U.S. treasury securities
Fair Value
Less Than 12 Months	0	0
12 Months or Greater	89,176	87,466
Total	89,176	87,466
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Greater	(2,856)	(4,149)
Total	(2,856)	(4,149)
U.S. agency
Fair Value
Less Than 12 Months	0	0
12 Months or Greater	14,804	14,571
Total	14,804	14,571
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Greater	(1,573)	(1,838)
Total	(1,573)	(1,838)
State, county & municipal securities
Fair Value
Less Than 12 Months	3,286	9,858
12 Months or Greater	101,998	105,734
Total	105,284	115,592
Gross Unrealized Losses
Less Than 12 Months	(47)	(1,392)
12 Months or Greater	(14,910)	(18,126)
Total	(14,957)	(19,518)
Mortgage-backed securities
Fair Value
Less Than 12 Months	0	13,580
12 Months or Greater	193,621	178,995
Total	193,621	192,575
Gross Unrealized Losses
Less Than 12 Months	0	(729)
12 Months or Greater	(25,646)	(28,392)
Total	$ (25,646)	$ (29,121)