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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt securities:
Amortized Cost	$ 445,098
Available-for-sale debt securities	434,697	$ 535,281
Amortized Cost	445,098	531,192
Gross Unrealized Gains	2,564	8,432
Gross Unrealized Losses	(12,965)	(4,343)
Available-for-sale securities	434,697	535,281
U.S. Government agencies
Debt securities:
Amortized Cost	22,728	65,994
Gross Unrealized Gains	0	667
Gross Unrealized Losses	(485)	(74)
Available-for-sale debt securities	22,243	66,587
Obligations of states and political subdivisions
Debt securities:
Amortized Cost	65,839	136,955
Gross Unrealized Gains	1,566	6,240
Gross Unrealized Losses	(1,291)	(90)
Available-for-sale debt securities	66,114	143,105
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Debt securities:
Amortized Cost	250,331	237,210
Gross Unrealized Gains	249	601
Gross Unrealized Losses	(6,632)	(2,903)
Available-for-sale debt securities	243,948	234,908
Private label mortgage and asset backed securities
Debt securities:
Amortized Cost	106,200	91,033
Gross Unrealized Gains	749	924
Gross Unrealized Losses	(4,557)	(1,276)
Available-for-sale debt securities	$ 102,392	$ 90,681

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