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Investments - Carrying value and estimated fair value (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Equity securities:    
Amortized Cost $ 434,162,000 $ 447,108,000
Gross Unrealized Gains 8,879,000 5,145,000
Gross Unrealized Losses (1,818,000) (9,029,000)
Available-for-sale investment securities 441,223,000 443,224,000
Held-to-maturity Securities, Debt Maturities [Abstract]    
Estimated Fair Value 33,666,000  
U.S. Government agencies
    
Debt securities:    
Amortized Cost 17,286,000 18,172,000
Gross Unrealized Gains 100,000 115,000
Gross Unrealized Losses (50,000) (84,000)
Estimated Fair Value 17,336,000 18,203,000
Obligations of states and political subdivisions
    
Debt securities:    
Amortized Cost 133,521,000 162,018,000
Gross Unrealized Gains 4,561,000 2,906,000
Gross Unrealized Losses (965,000) (6,517,000)
Estimated Fair Value 137,117,000 158,407,000
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost Basis 31,711,000  
Gross Unrealized Gains 1,983,000  
Gross Unrealized Losses (28,000)  
Estimated Fair Value 33,666,000  
U.S. Government agencies collateralized by residential mortgage obligations
    
Debt securities:    
Amortized Cost 272,082,000 254,978,000
Gross Unrealized Gains 2,823,000 1,075,000
Gross Unrealized Losses (803,000) (2,344,000)
Estimated Fair Value 274,102,000 253,709,000
Private label residential mortgage backed securities
    
Debt securities:    
Amortized Cost 3,677,000 4,344,000
Gross Unrealized Gains 1,358,000 1,047,000
Gross Unrealized Losses 0 0
Estimated Fair Value 5,035,000 5,391,000
Equity securities:    
Amortized Cost 21  
Other equity securities
    
Equity securities:    
Amortized Cost 7,596,000 7,596,000
Gross Unrealized Gains 37,000 2,000
Gross Unrealized Losses 0 (84,000)
Estimated Fair Value $ 7,633,000 $ 7,514,000