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Investments - Carrying value and estimated fair value (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities    
Available-for-sale investment securities, Amortized cost $ 419,270,000 $ 381,074,000
Gross Unrealized Gains 7,075,000 14,612,000
Gross Unrealized Losses (8,512,000) (1,721,000)
Available-for-sale Securities 417,833,000 393,965,000
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 16,410,000 9,443,000
Gross Unrealized Gains 198,000 34,000
Gross Unrealized Losses (29,000) (23,000)
Debt Securities, Estimated Fair Value 16,579,000 9,454,000
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 186,818,000 151,312,000
Gross Unrealized Gains 4,598,000 10,751,000
Gross Unrealized Losses (6,821,000) (385,000)
Debt Securities, Estimated Fair Value 184,595,000 161,678,000
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 203,728,000 206,465,000
Gross Unrealized Gains 1,295,000 3,152,000
Gross Unrealized Losses (1,662,000) (1,107,000)
Debt Securities, Estimated Fair Value 203,361,000 208,510,000
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 4,718,000 6,258,000
Gross Unrealized Gains 954,000 323,000
Gross Unrealized Losses 0 (206,000)
Debt Securities, Estimated Fair Value 5,672,000 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 30,000 352,000
Gross Unrealized Losses 0 0
Equity Securities, Estimated Fair Value $ 7,626,000 $ 7,948,000