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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 19,647 |
Due after one year through five years | 34,038 |
Due after five years through ten years | 81,750 |
Due after ten years | 160,241 |
Amortized Cost | 1,322,998 | $ 1,276,871
Fair Value |  |
Due within one year | 19,786 |
Due after one year through five years | 34,948 |
Due after five years through ten years | 84,830 |
Due after ten years | 157,388 |
Fair Value | 1,359,129 | 1,290,613
Other debt securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 39,888 |
Amortized Cost | 56,380 | 55,364
Fair Value |  |
Debt securities, without fixed maturity, fair value | 41,182 |
Fair Value | 57,812 | 56,365
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 709,117 |
Amortized Cost | 709,117 | 708,970
Fair Value |  |
Debt securities, without fixed maturity, fair value | 733,413 |
Fair Value | 733,413 | 716,105
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 32,625 |
Amortized Cost | 32,625 | 30,372
Fair Value |  |
Debt securities, without fixed maturity, fair value | 34,590 |
Fair Value | 34,590 | 31,007
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 159,940 |
Amortized Cost | 159,940 | 172,178
Fair Value |  |
Debt securities, without fixed maturity, fair value | 164,593 |
Fair Value | 164,593 | 173,238
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 85,752 |
Amortized Cost | 85,752 | 76,456
Fair Value |  |
Debt securities, without fixed maturity, fair value | 88,399 |
Fair Value | $ 88,399 | $ 77,751

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