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Investments - Carrying value and estimated fair value (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities    
Available-for-sale investment securities, Amortized cost $ 357,955,000 $ 381,074,000
Gross Unrealized Gains 11,976,000 14,612,000
Gross Unrealized Losses (1,969,000) (1,721,000)
Available-for-sale Securities 367,962,000 393,965,000
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 14,894,000 9,443,000
Gross Unrealized Gains 70,000 34,000
Gross Unrealized Losses (16,000) (23,000)
Debt Securities, Estimated Fair Value 14,948,000 9,454,000
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 149,843,000 151,312,000
Gross Unrealized Gains 9,166,000 10,751,000
Gross Unrealized Losses (1,144,000) (385,000)
Debt Securities, Estimated Fair Value 157,865,000 161,678,000
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 179,915,000 206,465,000
Gross Unrealized Gains 1,826,000 3,152,000
Gross Unrealized Losses (741,000) (1,107,000)
Debt Securities, Estimated Fair Value 181,000,000 208,510,000
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 5,707,000 6,258,000
Gross Unrealized Gains 618,000 323,000
Gross Unrealized Losses (68,000) (206,000)
Debt Securities, Estimated Fair Value 6,257,000 6,375,000
Other equity securities
    
Schedule of Available-for-sale Securities    
Equity Securities, Amortized Cost 7,596,000 7,596,000
Gross Unrealized Gains 296,000 352,000
Gross Unrealized Losses 0 0
Equity Securities, Estimated Fair Value $ 7,892,000 $ 7,948,000