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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
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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