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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
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 11,280  
After one year through five years, estimated fair value 12,258  
After five years through ten years, amortized cost 19,073  
After five years through ten years, estimated fair value 20,776  
After ten years, amortized cost 119,340  
After ten years, estimated fair value 124,680  
Total securities with single maturity date, amortized cost 149,843  
Total securities with single maturity date, estimated fair value 157,865  
Debt securities, amortized cost 357,955  
Available-for-sale Securities 367,962 393,965
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 14,894  
Investment securities not due at a single maturity date, estimated fair value 14,948  
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 179,915  
Investment securities not due at a single maturity date, estimated fair value 181,000  
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 5,707  
Investment securities not due at a single maturity date, estimated fair value 6,257  
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 $ 7,892