Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized cost and fair value of securities available for sale
Amortized Cost	$ 910,048	$ 1,062,649
Gross Unrealized Gains	770	424
Gross Unrealized Losses	(146,332)	(139,794)
Fair Value	764,486	923,279
Obligations of states and political subdivisions
Amortized cost and fair value of securities available for sale
Amortized Cost	21,669	36,374
Gross Unrealized Gains	88	119
Gross Unrealized Losses	(1,994)	(1,883)
Fair Value	19,763	34,610
Other debt securities
Amortized cost and fair value of securities available for sale
Amortized Cost	115,235	72,383
Gross Unrealized Gains	583	109
Gross Unrealized Losses	(4,431)	(4,458)
Fair Value	111,387	68,034
Government agency mortgage backed securities | Residential mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	198,253	301,400
Gross Unrealized Gains	99	172
Gross Unrealized Losses	(26,073)	(24,968)
Fair Value	172,279	276,604
Government agency mortgage backed securities | Commercial mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	6,023	6,029
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(679)	(637)
Fair Value	5,344	5,392
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	431,344	485,164
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(90,453)	(85,883)
Fair Value	340,891	399,281
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	137,524	161,299
Gross Unrealized Gains	0	24
Gross Unrealized Losses	(22,702)	(21,965)
Fair Value	$ 114,822	$ 139,358