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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Mar. 31, 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	2,480
After one year through five years, estimated fair value	2,617
After five years through ten years, amortized cost	21,332
After five years through ten years, estimated fair value	22,364
After ten years, amortized cost	79,769
After ten years, estimated fair value	81,982
Total securities with single maturity date, amortized cost	103,581
Total securities with single maturity date, estimated fair value	106,963
Debt securities, amortized cost	478,313
Equity securities	479,622	$ 463,905
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	19,263
Investment securities not due at a single maturity date, estimated fair value	18,929
Debt securities, amortized cost	19,263	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	224,597
Investment securities not due at a single maturity date, estimated fair value	222,613
Debt securities, amortized cost	224,597	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	126,872
Investment securities not due at a single maturity date, estimated fair value	127,117
Debt securities, amortized cost	126,872	$ 129,165
Corporate debt securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	4,000
Investment securities not due at a single maturity date, estimated fair value	4,000
Debt securities, amortized cost	$ 4,000

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