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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
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	3,349
After one year through five years, estimated fair value	3,659
After five years through ten years, amortized cost	94,640
After five years through ten years, estimated fair value	97,424
After ten years, amortized cost	406,424
After ten years, estimated fair value	416,847
Total securities with single maturity date, amortized cost	504,413
Total securities with single maturity date, estimated fair value	517,930
Debt securities, amortized cost	1,045,753
Equity securities	1,060,362	$ 710,092
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	489
Investment securities not due at a single maturity date, estimated fair value	505
Debt securities, amortized cost	489	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	226,027
Investment securities not due at a single maturity date, estimated fair value	228,045
Debt securities, amortized cost	226,027	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	255,324
Investment securities not due at a single maturity date, estimated fair value	253,756
Debt securities, amortized cost	255,324	82,413
Corporate debt securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	59,500
Investment securities not due at a single maturity date, estimated fair value	60,126
Debt securities, amortized cost	$ 59,500	$ 30,000

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