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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 150  
Within one year, estimated fair value 151  
After one year through five years, amortized cost 10,362  
After one year through five years, estimated fair value 11,365  
After five years through ten years, amortized cost 16,868  
After five years through ten years, estimated fair value 18,755  
After ten years, amortized cost 99,276  
After ten years, estimated fair value 107,366  
Total securities with single maturity date, amortized cost 126,656  
Total securities with single maturity date, estimated fair value 137,637  
Debt securities, amortized cost 351,037  
Available-for-sale Securities 364,808 328,413
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 2,317  
Investment securities not due at a single maturity date, estimated fair value 2,318  
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 207,740  
Investment securities not due at a single maturity date, estimated fair value 210,135  
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 6,728  
Investment securities not due at a single maturity date, estimated fair value 6,678  
Other equity securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 7,596  
Investment securities not due at a single maturity date, estimated fair value $ 8,040