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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Amortized Cost	$ 1,293,239	$ 1,363,902
Fair Value
Total available-for-sale debt securities	1,298,587	1,332,658
Debt securities
Amortized Cost
Due in one year or less	107,975	78,160
Due after one year through five years	270,477	355,499
Due after five years through ten years	77,710	139,560
Due after ten years	12,397	9,201
Amortized Cost	468,559	582,420
Fair Value
Due in one year or less	108,089	77,930
Due after one year through five years	274,798	350,470
Due after five years through ten years	79,165	136,734
Due after ten years	12,494	8,668
Total available-for-sale debt securities	474,546	573,802
Mortgage-backed securities
Amortized Cost
Amortized Cost	824,680	781,482
Fair Value
Total available-for-sale debt securities	$ 824,041	$ 758,856

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