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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt securities:    
Amortized Cost $ 426,092  
Equity securities:    
Amortized Cost 426,092 $ 423,639
Gross Unrealized Gains 7,798 10,243
Gross Unrealized Losses (3,630) (1,347)
Available-for-sale investment securities 430,260 432,535
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost Basis 32,230 31,964
Estimated Fair Value 34,444 35,096
U.S. Government agencies    
Debt securities:    
Amortized Cost 49,663 33,088
Gross Unrealized Gains 314 245
Gross Unrealized Losses (211) (243)
Estimated Fair Value 49,766 33,090
Obligations of states and political subdivisions    
Debt securities:    
Amortized Cost 161,817 143,343
Gross Unrealized Gains 3,867 6,266
Gross Unrealized Losses (2,679) (314)
Estimated Fair Value 163,005 149,295
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost Basis 32,230 31,964
Gross Unrealized Gains 2,233 3,138
Gross Unrealized Losses (19) (6)
Estimated Fair Value 34,444 35,096
U.S. Government agencies collateralized by residential mortgage obligations    
Debt securities:    
Amortized Cost 204,476 236,629
Gross Unrealized Gains 1,943 2,033
Gross Unrealized Losses (740) (790)
Estimated Fair Value 205,679 237,872
Private label residential mortgage backed securities    
Debt securities:    
Amortized Cost 2,636 3,079
Gross Unrealized Gains 1,624 1,614
Gross Unrealized Losses 0 0
Estimated Fair Value 4,260 4,693
Other equity securities    
Equity securities:    
Amortized Cost 7,500 7,500
Gross Unrealized Gains 50 85
Gross Unrealized Losses 0 0
Estimated Fair Value $ 7,550 $ 7,585