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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt securities:    
Amortized Cost $ 444,728  
Equity securities:    
Amortized Cost 444,728 $ 423,639
Gross Unrealized Gains 9,781 10,243
Gross Unrealized Losses (1,667) (1,347)
Available-for-sale investment securities 452,842 432,535
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost Basis 32,367 31,964
Estimated Fair Value 35,256 35,096
U.S. Government agencies    
Debt securities:    
Amortized Cost 51,679 33,088
Gross Unrealized Gains 377 245
Gross Unrealized Losses (142) (243)
Estimated Fair Value 51,914 33,090
Obligations of states and political subdivisions    
Debt securities:    
Amortized Cost 174,758 143,343
Gross Unrealized Gains 5,358 6,266
Gross Unrealized Losses (1,117) (314)
Estimated Fair Value 178,999 149,295
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost Basis 32,367 31,964
Gross Unrealized Gains 2,900 3,138
Gross Unrealized Losses (11) (6)
Estimated Fair Value 35,256 35,096
U.S. Government agencies collateralized by residential mortgage obligations    
Debt securities:    
Amortized Cost 208,318 236,629
Gross Unrealized Gains 2,633 2,033
Gross Unrealized Losses (408) (790)
Estimated Fair Value 210,543 237,872
Private label residential mortgage backed securities    
Debt securities:    
Amortized Cost 2,473 3,079
Gross Unrealized Gains 1,272 1,614
Gross Unrealized Losses 0 0
Estimated Fair Value 3,745 4,693
Other equity securities    
Equity securities:    
Amortized Cost 7,500 7,500
Gross Unrealized Gains 141 85
Gross Unrealized Losses 0 0
Estimated Fair Value $ 7,641 $ 7,585