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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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