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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt securities:
Amortized Cost	$ 526,678
Equity securities:
Amortized Cost	526,678	$ 548,640
Gross Unrealized Gains	8,792	7,871
Gross Unrealized Losses	(6,230)	(8,762)
Available-for-sale securities	529,240	547,749
U.S. Government agencies
Debt securities:
Amortized Cost	66,472	69,005
Gross Unrealized Gains	258	242
Gross Unrealized Losses	(192)	(277)
Estimated Fair Value	66,538	68,970
Obligations of states and political subdivisions
Debt securities:
Amortized Cost	265,764	288,543
Gross Unrealized Gains	7,017	6,109
Gross Unrealized Losses	(2,846)	(4,353)
Estimated Fair Value	269,935	290,299
U.S. Government agencies collateralized by residential mortgage obligations
Debt securities:
Amortized Cost	185,219	181,785
Gross Unrealized Gains	532	484
Gross Unrealized Losses	(3,108)	(4,048)
Estimated Fair Value	182,643	178,221
Private label residential mortgage backed securities
Debt securities:
Amortized Cost	1,723	1,807
Gross Unrealized Gains	985	1,036
Gross Unrealized Losses	0	0
Estimated Fair Value	2,708	2,843
Other equity securities
Equity securities:
Amortized Cost	7,500	7,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(84)	(84)
Estimated Fair Value	$ 7,416	$ 7,416

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