Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,050,865	$ 1,021,162
Gross Unrealized Gains	3,577	7,496
Gross Unrealized Losses	(46,302)	(42,381)
Fair Value	1,008,140	986,277
Interest receivable	3,200	3,300
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	86,125	86,381
Gross Unrealized Gains	92	110
Gross Unrealized Losses	(2,056)	(1,984)
Fair Value	84,161	84,507
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	658,717	650,314
Gross Unrealized Gains	2,068	4,961
Gross Unrealized Losses	(34,283)	(31,012)
Fair Value	626,502	624,263
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,690	35,994
Gross Unrealized Gains	6	7
Gross Unrealized Losses	(4,602)	(4,665)
Fair Value	33,094	31,336
Commercial mortgage-backed securities of U.S. government corporations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	263,458	243,571
Gross Unrealized Gains	1,408	2,411
Gross Unrealized Losses	(5,361)	(4,720)
Fair Value	259,505	241,262
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,875	4,902
Gross Unrealized Gains	3	7
Gross Unrealized Losses	0	0
Fair Value	$ 4,878	$ 4,909