Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 17,981
Due after one year through five years	162,227
Due after five years through ten years	27,160
Due after ten years	11,426
Available-for-Sale Debt Securities With Maturities, Amortized Cost	218,794
Amortized Cost	1,071,876	$ 1,104,105
Fair Value
Due in one year or less	17,624
Due after one year through five years	148,717
Due after five years through ten years	25,814
Due after ten years	11,323
Available-for-Sale Debt Securities With Maturities, Fair Value	203,478
Total Available-for-Sale Debt Securities, Fair Value	969,425	1,001,784
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	485,131
Amortized Cost	485,131	482,039
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	428,889
Total Available-for-Sale Debt Securities, Fair Value	428,889	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	46,958
Amortized Cost	46,958	49,418
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	39,780
Total Available-for-Sale Debt Securities, Fair Value	39,780	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	320,993
Amortized Cost	320,993	352,465
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	297,278
Total Available-for-Sale Debt Securities, Fair Value	$ 297,278	$ 327,313