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Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 15,282
Due after one year through five years	127,993
Due after five years through ten years	19,866
Due after ten years	0
Available-for-Sale Debt Securities With Fixed Maturities	163,141
Amortized Cost	1,059,119	$ 1,051,313
Fair Value
Due in one year or less	15,026
Due after one year through five years	123,156
Due after five years through ten years	19,666
Due after ten years	0
Available-for-Sale Debt Securities With Fixed Maturities	157,848
Total Available-for-Sale Debt Securities, Fair Value	1,006,857	969,308
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	598,762
Amortized Cost	598,762	507,942
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	565,312
Total Available-for-Sale Debt Securities, Fair Value	565,312	460,939
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	41,069
Amortized Cost	41,069	44,707
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	35,653
Total Available-for-Sale Debt Securities, Fair Value	35,653	38,177
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	256,147
Amortized Cost	256,147	290,775
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	248,044
Total Available-for-Sale Debt Securities, Fair Value	$ 248,044	$ 273,425

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