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Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized Cost    
Total $ 731,510 $ 468,559
Mortgage-backed securities 905,745 824,680
Total available-for-sale debt securities 1,637,255 1,293,239
Fair Value    
Total 744,105 474,546
Mortgage-backed securities 922,661 824,041
Total available-for-sale debt securities 1,666,766 1,298,587
Available-for-sale securities    
Amortized Cost    
Due in one year or less 53,447 107,975
Due after one year through five years 391,466 270,477
Due after five years through ten years 221,525 77,710
Due after ten years 65,072 12,397
Fair Value    
Due in one year or less 54,083 108,089
Due after one year through five years 401,757 274,798
Due after five years through ten years 222,846 79,165
Due after ten years $ 65,419 $ 12,494