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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 40,237	$ 50,922
Due after one year through five years	554,392	508,880
Due after five years through ten years	325,346	367,743
Due after ten years	36,638	39,916
Total	956,613	967,461
Mortgage-backed securities	838,810	864,330
Amortized Cost	1,795,423	1,831,791
Fair Value
Due in one year or less	39,828	50,269
Due after one year through five years	506,082	459,721
Due after five years through ten years	283,610	314,408
Due after ten years	30,133	31,679
Total	859,653	856,077
Mortgage-backed securities	726,201	738,890
Fair Value	$ 1,585,854	$ 1,594,967

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