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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 301 |
Within one year, estimated fair value | 305 |
After one year through five years, amortized cost | 3,285 |
After one year through five years, estimated fair value | 3,612 |
After five years through ten years, amortized cost | 24,932 |
After five years through ten years, estimated fair value | 26,876 |
After ten years, amortized cost | 379,670 |
After ten years, estimated fair value | 382,690 |
Total securities with single maturity date, amortized cost | 408,188 |
Total securities with single maturity date, estimated fair value | 413,483 |
Debt securities, amortized cost | 761,249 |
Equity securities | 768,719 | $ 710,092
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 644 |
Investment securities not due at a single maturity date, estimated fair value | 655 |
Debt securities, amortized cost | 644 | 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 | 212,364 |
Investment securities not due at a single maturity date, estimated fair value | 214,386 |
Debt securities, amortized cost | 212,364 | 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 | 108,053 |
Investment securities not due at a single maturity date, estimated fair value | 107,920 |
Debt securities, amortized cost | 108,053 | 82,413
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 32,000 |
Investment securities not due at a single maturity date, estimated fair value | 32,275 |
Debt securities, amortized cost | $ 32,000 | $ 30,000

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