Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Amortized Cost
Due in one year or less	$ 30,083
Due after one year through five years	51,022
Due after five years through ten years	9,895
Due after ten years	0
Available-for-Sale Debt Securities With Fixed Maturities	91,000
Amortized Cost	1,050,865	$ 1,021,162
Fair Value
Due in one year or less	30,036
Due after one year through five years	49,075
Due after five years through ten years	9,928
Due after ten years	0
Available-for-Sale Debt Securities With Fixed Maturities	89,039
Total Available-for-Sale Debt Securities, Fair Value	1,008,140	986,277
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	658,717
Amortized Cost	658,717	650,314
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	626,502
Total Available-for-Sale Debt Securities, Fair Value	626,502	624,263
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	37,690
Amortized Cost	37,690	35,994
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	33,094
Total Available-for-Sale Debt Securities, Fair Value	33,094	31,336
Commercial mortgage-backed securities of U.S. government corporations
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	263,458
Amortized Cost	263,458	243,571
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	259,505
Total Available-for-Sale Debt Securities, Fair Value	$ 259,505	$ 241,262