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Investments - Carrying value and estimated fair value (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities    
Equity Securities, Amortized Cost $ 7,596,000 $ 7,596,000
Available-for-sale investment securities, Amortized cost 351,037,000 321,405,000
Gross Unrealized Gains 14,864,000 9,674,000
Gross Unrealized Losses (1,093,000) (2,666,000)
Equity Securities, Estimated Fair Value 8,040,000 7,891,000
Available-for-sale Securities 364,808,000 328,413,000
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 2,317,000 149,000
Gross Unrealized Gains 1,000 0
Gross Unrealized Losses 0 0
Debt Securities, Estimated Fair Value 2,318,000 149,000
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 126,656,000 101,030,000
Gross Unrealized Gains 11,050,000 7,732,000
Gross Unrealized Losses (69,000) (331,000)
Debt Securities, Estimated Fair Value 137,637,000 108,431,000
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 207,740,000 204,222,000
Gross Unrealized Gains 3,108,000 1,402,000
Gross Unrealized Losses (713,000) (1,080,000)
Debt Securities, Estimated Fair Value 210,135,000 204,544,000
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Debt Securities, Amortized Cost 6,728,000 8,408,000
Gross Unrealized Gains 261,000 245,000
Gross Unrealized Losses (311,000) (1,255,000)
Debt Securities, Estimated Fair Value 6,678,000 7,398,000
Other equity securities
    
Schedule of Available-for-sale Securities    
Gross Unrealized Gains 444,000 295,000
Gross Unrealized Losses $ 0 $ 0