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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 10,286 |
Due after one year through five years | 40,177 |
Due after five years through ten years | 66,563 |
Due after ten years | 235,945 |
Amortized Cost | 1,515,958 | $ 1,301,973
Fair Value |  |
Due within one year | 10,401 |
Due after one year through five years | 41,896 |
Due after five years through ten years | 69,568 |
Due after ten years | 239,498 |
Fair Value | 1,536,041 | 1,343,457
Other debt securities |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 33,327 |
Amortized Cost | 61,113 | 62,771
Fair Value |  |
Debt securities, without fixed maturity, fair value | 34,708 |
Fair Value | 63,199 | 65,607
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 453,792 |
Amortized Cost | 453,792 | 581,105
Fair Value |  |
Debt securities, without fixed maturity, fair value | 466,455 |
Fair Value | 466,455 | 602,646
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 22,448 |
Amortized Cost | 22,448 | 29,053
Fair Value |  |
Debt securities, without fixed maturity, fair value | 23,005 |
Fair Value | 23,005 | 30,287
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 538,317 |
Amortized Cost | 538,317 | 218,373
Fair Value |  |
Debt securities, without fixed maturity, fair value | 535,332 |
Fair Value | 535,332 | 220,268
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized Cost |  |
Debt securities, without fixed maturity, amortized cost | 115,103 |
Amortized Cost | 115,103 | 99,377
Fair Value |  |
Debt securities, without fixed maturity, fair value | 115,178 |
Fair Value | $ 115,178 | $ 102,348

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