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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 21,604 |
Due after one year through five years | 30,383 |
Due after five years through ten years | 76,550 |
Due after ten years | 108,713 |
Amortized Cost | 1,222,123 | $ 1,264,529
Fair Value |  |
Due within one year | 21,839 |
Due after one year through five years | 31,139 |
Due after five years through ten years | 79,296 |
Due after ten years | 108,264 |
Fair Value | 1,238,577 | 1,250,777
Other debt securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 36,229 |
Amortized Cost | 46,739 | 44,046
Fair Value |  |
Debt securities, without fixed maturity, fair value | 37,596 |
Fair Value | 48,249 | 43,927
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 658,830 |
Amortized Cost | 658,830 | 621,690
Fair Value |  |
Debt securities, without fixed maturity, fair value | 666,167 |
Fair Value | 666,167 | 613,283
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 26,794 |
Amortized Cost | 26,794 | 21,957
Fair Value |  |
Debt securities, without fixed maturity, fair value | 27,666 |
Fair Value | 27,666 | 21,830
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 189,332 |
Amortized Cost | 189,332 | 332,697
Fair Value |  |
Debt securities, without fixed maturity, fair value | 191,187 |
Fair Value | 191,187 | 326,989
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 73,688 |
Amortized Cost | 73,688 | 28,446
Fair Value |  |
Debt securities, without fixed maturity, fair value | 75,423 |
Fair Value | $ 75,423 | $ 28,335

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