Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 17,997
Due after one year through five years	162,281
Due after five years through ten years	16,284
Due after ten years	11,327
Available-for-Sale Debt Securities With Fixed Maturities	207,889
Amortized Cost	1,051,313	$ 1,104,105
Fair Value
Due in one year or less	17,719
Due after one year through five years	151,236
Due after five years through ten years	16,368
Due after ten years	11,444
Available-for-Sale Debt Securities With Fixed Maturities	196,767
Total Available-for-Sale Debt Securities, Fair Value	969,308	1,001,784
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	507,942
Amortized Cost	507,942	482,039
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	460,939
Total Available-for-Sale Debt Securities, Fair Value	460,939	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	44,707
Amortized Cost	44,707	49,418
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	38,177
Total Available-for-Sale Debt Securities, Fair Value	38,177	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	290,775
Amortized Cost	290,775	352,465
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	273,425
Total Available-for-Sale Debt Securities, Fair Value	$ 273,425	$ 327,313