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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 115  
Within one year, estimated fair value 115  
After one year through five years, amortized cost 12,804  
After one year through five years, estimated fair value 13,658  
After five years through ten years, amortized cost 24,758  
After five years through ten years, estimated fair value 25,645  
After ten years, amortized cost 149,141  
After ten years, estimated fair value 145,177  
Total securities with single maturity date, amortized cost 186,818  
Total securities with single maturity date, estimated fair value 184,595  
Debt securities, amortized cost 419,270  
Available-for-sale Securities 417,833 393,965
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 16,410  
Investment securities not due at a single maturity date, estimated fair value 16,579  
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 203,728  
Investment securities not due at a single maturity date, estimated fair value 203,361  
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 4,718  
Investment securities not due at a single maturity date, estimated fair value 5,672  
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 $ 7,626