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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 41,421 |
Due after one year through five years | 48,858 |
Due after five years through ten years | 81,381 |
Due after ten years | 61,925 |
Amortized Cost | 1,201,389 | $ 674,104
Fair Value |  |
Due within one year | 41,815 |
Due after one year through five years | 49,351 |
Due after five years through ten years | 81,580 |
Due after ten years | 60,153 |
Fair Value | 1,177,606 | 671,488
Other debt securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 26,500 |
Amortized Cost | 35,308 | 17,106
Fair Value |  |
Debt securities, without fixed maturity, fair value | 26,195 |
Fair Value | 34,965 | 17,290
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 573,236 |
Amortized Cost | 573,236 | 196,121
Fair Value |  |
Debt securities, without fixed maturity, fair value | 560,587 |
Fair Value | 560,587 | 193,950
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 22,094 |
Amortized Cost | 22,094 | 31,015
Fair Value |  |
Debt securities, without fixed maturity, fair value | 21,735 |
Fair Value | 21,735 | 31,170
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 316,642 |
Amortized Cost | 316,642 | 180,258
Fair Value |  |
Debt securities, without fixed maturity, fair value | 307,228 |
Fair Value | 307,228 | 176,639
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 29,332 |
Amortized Cost | 29,332 | 5,019
Fair Value |  |
Debt securities, without fixed maturity, fair value | 28,962 |
Fair Value | $ 28,962 | $ 5,006

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