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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 1,363,902 | $ 1,408,996
Fair Value |  |
Total available-for-sale debt securities | 1,332,658 | 1,391,862
Debt securities |  |
Amortized Cost |  |
Due in one year or less | 78,160 | 51,909
Due after one year through five years | 355,499 | 368,846
Due after five years through ten years | 139,560 | 162,061
Due after ten years | 9,201 | 18,591
Amortized Cost | 582,420 | 601,407
Fair Value |  |
Due in one year or less | 77,930 | 51,932
Due after one year through five years | 350,470 | 367,377
Due after five years through ten years | 136,734 | 160,374
Due after ten years | 8,668 | 18,191
Total available-for-sale debt securities | 573,802 | 597,874
Mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 781,482 | 807,589
Fair Value |  |
Total available-for-sale debt securities | $ 758,856 | $ 793,988

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