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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 150  
Within one year, estimated fair value 150  
After one year through five years, amortized cost 12,688  
After one year through five years, estimated fair value 13,578  
After five years through ten years, amortized cost 23,314  
After five years through ten years, estimated fair value 24,187  
After ten years, amortized cost 133,853  
After ten years, estimated fair value 129,976  
Total securities with single maturity date, amortized cost 170,005  
Total securities with single maturity date, estimated fair value 167,891  
Debt securities, amortized cost 377,074  
Available-for-sale Securities 374,840 393,965
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 14,621  
Investment securities not due at a single maturity date, estimated fair value 14,853  
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 179,620  
Investment securities not due at a single maturity date, estimated fair value 178,372  
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 5,232  
Investment securities not due at a single maturity date, estimated fair value 6,087  
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 $ 7,637