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Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Total $ 1,117,083 $ 1,108,186
Mortgage-backed securities 893,018 955,604
Amortized Cost 2,010,101 2,063,790
Fair Value    
Total 982,063 1,096,800
Mortgage-backed securities 758,873 947,713
Fair Value 1,740,936 2,044,513
Available-for-sale securities    
Amortized Cost    
Due in one year or less 32,225 77,159
Due after one year through five years 572,260 474,537
Due after five years through ten years 470,646 501,748
Due after ten years 41,952 54,742
Fair Value    
Due in one year or less 31,929 77,892
Due after one year through five years 520,304 471,776
Due after five years through ten years 398,123 492,573
Due after ten years $ 31,707 $ 54,559