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Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized Cost
Amortized Cost	$ 1,140,086	$ 1,363,902
Fair Value
Total	1,142,452	1,332,658
Available-for-sale securities
Amortized Cost
Due in one year or less	91,952	78,160
Due after one year through five years	225,410	355,499
Due after five years through ten years	75,180	139,560
Due after ten years	10,798	9,201
Amortized Cost	403,340	582,420
Fair Value
Due in one year or less	92,005	77,930
Due after one year through five years	227,476	350,470
Due after five years through ten years	75,930	136,734
Due after ten years	10,929	8,668
Total	406,340	573,802
Mortgage-backed securities
Amortized Cost
Amortized Cost	736,746	781,482
Fair Value
Total	$ 736,112	$ 758,856

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