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Investment Securities - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 0 | $ 1,893
Within one year, estimated fair value | 0 | 1,914
After one year through five years, amortized cost | 2,769 | 7,149
After one year through five years, estimated fair value | 2,899 | 7,316
After five years through ten years, amortized cost | 21,831 | 22,043
After five years through ten years, estimated fair value | 22,278 | 22,696
After ten years, amortized cost | 55,286 | 105,870
After ten years, estimated fair value | 56,327 | 111,179
Total securities with single maturity date, amortized cost | 79,886 | 136,955
Total securities with single maturity date, estimated fair value | 81,504 | 143,105
Debt securities, amortized cost | 470,162 | 531,192
Available-for-sale investment securities | 463,905 | 535,281
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 21,723 | 65,994
Investment securities not due at a single maturity date, estimated fair value | 21,321 | 66,587
Debt securities, amortized cost | 21,723 | 65,994
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 239,388 | 237,210
Investment securities not due at a single maturity date, estimated fair value | 234,930 | 234,908
Debt securities, amortized cost | 239,388 | 237,210
Private label residential mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 129,165 | 91,033
Investment securities not due at a single maturity date, estimated fair value | 126,150 | 90,681
Debt securities, amortized cost | $ 129,165 | $ 91,033

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