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Securities - Available for Sale Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Amortized Cost	$ 1,318,416	$ 1,293,239
Fair Value
Total	1,352,637	1,298,587
Total available-for-sale securities
Amortized Cost
Due in one year or less	63,817	107,975
Due after one year through five years	222,678	270,477
Due after five years through ten years	81,418	77,710
Due after ten years	39,870	12,397
Amortized Cost	407,783	468,559
Fair Value
Due in one year or less	64,031	108,089
Due after one year through five years	232,268	274,798
Due after five years through ten years	83,920	79,165
Due after ten years	39,876	12,494
Total	420,095	474,546
Mortgage-backed securities
Amortized Cost
Amortized Cost	910,633	824,680
Fair Value
Total	$ 932,542	$ 824,041

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