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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Debt securities:
Amortized Cost	$ 533,044
Equity securities:
Amortized Cost	533,044	$ 470,080
Gross Unrealized Gains	19,615	9,406
Gross Unrealized Losses	(1,584)	(1,932)
Available-for-sale investment securities	551,075	477,554
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost Basis	0	31,712
Estimated Fair Value		31,712
U.S. Government agencies
Debt securities:
Amortized Cost	48,007	52,803
Gross Unrealized Gains	411	315
Gross Unrealized Losses	(152)	(217)
Estimated Fair Value	48,266	52,901
Obligations of states and political subdivisions
Debt securities:
Amortized Cost	227,321	181,785
Gross Unrealized Gains	15,078	6,779
Gross Unrealized Losses	(191)	(296)
Estimated Fair Value	242,208	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	248,321	225,636
Gross Unrealized Gains	2,886	1,042
Gross Unrealized Losses	(1,241)	(1,419)
Estimated Fair Value	249,966	225,259
Private label residential mortgage backed securities
Debt securities:
Amortized Cost	1,895	2,356
Gross Unrealized Gains	1,064	1,234
Gross Unrealized Losses	0	0
Estimated Fair Value	2,959	3,590
Other equity securities
Equity securities:
Amortized Cost	7,500	7,500
Gross Unrealized Gains	176	36
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 7,676	$ 7,536

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