Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 9,988
Due after one year through five years	159,631
Due after five years through ten years	38,147
Due after ten years	11,474
Available-for-Sale Debt Securities With Maturities, Amortized Cost	219,240
Amortized Cost	1,085,963	$ 1,104,105
Fair Value
Due in one year or less	9,827
Due after one year through five years	149,422
Due after five years through ten years	35,922
Due after ten years	11,523
Available-for-Sale Debt Securities With Maturities, Fair Value	206,694
Total Available-for-Sale Debt Securities, Fair Value	997,702	1,001,784
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	479,804
Amortized Cost	479,804	482,039
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	432,739
Total Available-for-Sale Debt Securities, Fair Value	432,739	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	48,273
Amortized Cost	48,273	49,418
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	41,170
Total Available-for-Sale Debt Securities, Fair Value	41,170	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	338,646
Amortized Cost	338,646	352,465
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	317,099
Total Available-for-Sale Debt Securities, Fair Value	$ 317,099	$ 327,313