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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 304 |
Within one year, estimated fair value | 305 |
After one year through five years, amortized cost | 3,317 |
After one year through five years, estimated fair value | 3,627 |
After five years through ten years, amortized cost | 84,162 |
After five years through ten years, estimated fair value | 86,564 |
After ten years, amortized cost | 390,454 |
After ten years, estimated fair value | 403,156 |
Total securities with single maturity date, amortized cost | 478,237 |
Total securities with single maturity date, estimated fair value | 493,652 |
Debt securities, amortized cost | 934,138 |
Equity securities | 952,416 | $ 710,092
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 637 |
Investment securities not due at a single maturity date, estimated fair value | 653 |
Debt securities, amortized cost | 637 | 651
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 | 224,920 |
Investment securities not due at a single maturity date, estimated fair value | 227,042 |
Debt securities, amortized cost | 224,920 | 214,203
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 180,844 |
Investment securities not due at a single maturity date, estimated fair value | 180,781 |
Debt securities, amortized cost | 180,844 | 82,413
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 49,500 |
Investment securities not due at a single maturity date, estimated fair value | 50,288 |
Debt securities, amortized cost | $ 49,500 | $ 30,000

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