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Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Amortized Cost    
Total $ 1,152,447 $ 1,108,186
Mortgage-backed securities 922,573 955,604
Amortized Cost 2,075,020 2,063,790
Fair Value    
Total 1,058,033 1,096,800
Mortgage-backed securities 833,685 947,713
Fair Value 1,891,718 2,044,513
Available-for-sale securities    
Amortized Cost    
Due in one year or less 61,909 77,159
Due after one year through five years 534,330 474,537
Due after five years through ten years 505,724 501,748
Due after ten years 50,484 54,742
Fair Value    
Due in one year or less 61,879 77,892
Due after one year through five years 503,095 471,776
Due after five years through ten years 451,324 492,573
Due after ten years $ 41,735 $ 54,559