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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Amortized Cost	$ 478,313
Available-for-sale debt securities	479,622	$ 463,905
Amortized Cost	478,313	470,162
Gross Unrealized Gains	4,976	3,214
Gross Unrealized Losses	(3,667)	(9,471)
Available-for-sale securities	479,622	463,905
U.S. Government agencies
Schedule of Available-for-sale Securities
Amortized Cost	19,263	21,723
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(334)	(402)
Available-for-sale debt securities	18,929	21,321
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	103,581	79,886
Gross Unrealized Gains	3,432	2,205
Gross Unrealized Losses	(50)	(587)
Available-for-sale debt securities	106,963	81,504
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	224,597	239,388
Gross Unrealized Gains	612	253
Gross Unrealized Losses	(2,596)	(4,711)
Available-for-sale debt securities	222,613	234,930
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Amortized Cost	126,872	129,165
Gross Unrealized Gains	932	756
Gross Unrealized Losses	(687)	(3,771)
Available-for-sale debt securities	127,117	$ 126,150
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	4,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Available-for-sale debt securities	$ 4,000

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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