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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Within one year, amortized cost	$ 295
Within one year, estimated fair value	304
After one year through five years, amortized cost	1,314
After one year through five years, estimated fair value	1,454
After five years through ten years, amortized cost	31,221
After five years through ten years, estimated fair value	34,368
After ten years, amortized cost	247,676
After ten years, estimated fair value	258,747
Total securities with single maturity date, amortized cost	280,506
Total securities with single maturity date, estimated fair value	294,873
Debt securities, amortized cost	615,575
Equity securities	631,854	$ 470,746
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	40,913
Investment securities not due at a single maturity date, estimated fair value	40,628
Debt securities, amortized cost	40,913	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	216,084
Investment securities not due at a single maturity date, estimated fair value	217,282
Debt securities, amortized cost	216,084	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	54,072
Investment securities not due at a single maturity date, estimated fair value	55,222
Debt securities, amortized cost	54,072	155,308
Corporate debt securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	24,000
Investment securities not due at a single maturity date, estimated fair value	23,849
Debt securities, amortized cost	$ 24,000	$ 9,000

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