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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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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 | 1,593 |
After one year through five years, estimated fair value | 1,749 |
After five years through ten years, amortized cost | 29,964 |
After five years through ten years, estimated fair value | 31,935 |
After ten years, amortized cost | 187,467 |
After ten years, estimated fair value | 196,171 |
Total securities with single maturity date, amortized cost | 219,024 |
Total securities with single maturity date, estimated fair value | 229,855 |
Debt securities, amortized cost | 533,964 |
Equity securities | 544,502 | $ 470,746
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 42,085 |
Investment securities not due at a single maturity date, estimated fair value | 41,706 |
Debt securities, amortized cost | 42,085 | 14,740
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 | 201,373 |
Investment securities not due at a single maturity date, estimated fair value | 201,837 |
Debt securities, amortized cost | 201,373 | 198,125
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 52,482 |
Investment securities not due at a single maturity date, estimated fair value | 52,501 |
Debt securities, amortized cost | 52,482 | 155,308
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 19,000 |
Investment securities not due at a single maturity date, estimated fair value | 18,603 |
Debt securities, amortized cost | $ 19,000 | $ 9,000

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