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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
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	2,496
After one year through five years, estimated fair value	2,642
After five years through ten years, amortized cost	9,145
After five years through ten years, estimated fair value	9,763
After ten years, amortized cost	14,936
After ten years, estimated fair value	16,970
Total securities with single maturity date, amortized cost	26,577
Total securities with single maturity date, estimated fair value	29,375
Debt securities, amortized cost	469,471
Equity securities	476,211	$ 463,905
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	18,167
Investment securities not due at a single maturity date, estimated fair value	17,903
Debt securities, amortized cost	18,167	21,723
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	225,045
Investment securities not due at a single maturity date, estimated fair value	224,941
Debt securities, amortized cost	225,045	239,388
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	190,682
Investment securities not due at a single maturity date, estimated fair value	194,813
Debt securities, amortized cost	190,682	$ 129,165
Corporate debt securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	9,000
Investment securities not due at a single maturity date, estimated fair value	9,179
Debt securities, amortized cost	$ 9,000

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