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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt securities:
Amortized Cost	$ 488,425
Equity securities:
Amortized Cost	488,425	$ 470,080
Gross Unrealized Gains	14,367	9,406
Gross Unrealized Losses	(814)	(1,932)
Available-for-sale investment securities	501,978	477,554
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost Basis	0	31,712
Estimated Fair Value		35,096
U.S. Government agencies
Debt securities:
Amortized Cost	51,194	52,803
Gross Unrealized Gains	499	315
Gross Unrealized Losses	(135)	(217)
Estimated Fair Value	51,558	52,901
Obligations of states and political subdivisions
Debt securities:
Amortized Cost	204,242	181,785
Gross Unrealized Gains	10,611	6,779
Gross Unrealized Losses	(96)	(296)
Estimated Fair Value	214,757	188,268
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost Basis		31,712
Gross Unrealized Gains		3,431
Gross Unrealized Losses		(1)
Estimated Fair Value		35,142
U.S. Government agencies collateralized by residential mortgage obligations
Debt securities:
Amortized Cost	223,234	225,636
Gross Unrealized Gains	1,990	1,042
Gross Unrealized Losses	(583)	(1,419)
Estimated Fair Value	224,641	225,259
Private label residential mortgage backed securities
Debt securities:
Amortized Cost	2,255	2,356
Gross Unrealized Gains	1,119	1,234
Gross Unrealized Losses	0	0
Estimated Fair Value	3,374	3,590
Other equity securities
Equity securities:
Amortized Cost	7,500	7,500
Gross Unrealized Gains	148	36
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 7,648	$ 7,536

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