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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 0 |
Within one year, estimated fair value | 0 |
After one year through five years, amortized cost | 2,480 |
After one year through five years, estimated fair value | 2,617 |
After five years through ten years, amortized cost | 21,332 |
After five years through ten years, estimated fair value | 22,364 |
After ten years, amortized cost | 79,769 |
After ten years, estimated fair value | 81,982 |
Total securities with single maturity date, amortized cost | 103,581 |
Total securities with single maturity date, estimated fair value | 106,963 |
Debt securities, amortized cost | 478,313 |
Equity securities | 479,622 | $ 463,905
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 19,263 |
Investment securities not due at a single maturity date, estimated fair value | 18,929 |
Debt securities, amortized cost | 19,263 | 21,723
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 | 224,597 |
Investment securities not due at a single maturity date, estimated fair value | 222,613 |
Debt securities, amortized cost | 224,597 | 239,388
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 126,872 |
Investment securities not due at a single maturity date, estimated fair value | 127,117 |
Debt securities, amortized cost | 126,872 | $ 129,165
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 4,000 |
Investment securities not due at a single maturity date, estimated fair value | 4,000 |
Debt securities, amortized cost | $ 4,000 |

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