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Securities - Available for Sale Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Amortized Cost	$ 1,359,102	$ 1,363,902
Fair Value
Total	1,343,610	1,332,658
Total available-for-sale securities
Amortized Cost
Due in one year or less	117,858	78,160
Due after one year through five years	308,679	355,499
Due after five years through ten years	130,809	139,560
Due after ten years	11,712	9,201
Amortized Cost	569,058	582,420
Fair Value
Due in one year or less	117,495	77,930
Due in one year or less	306,959	350,470
Due after five years through ten years	130,118	136,734
Due after ten years	11,681	8,668
Total	566,253	573,802
Mortgage-backed securities
Amortized Cost
Amortized Cost	790,044	781,482
Fair Value
Total	$ 777,357	$ 758,856

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