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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 0  
Within one year, estimated fair value 0  
After one year through five years, amortized cost 2,673  
After one year through five years, estimated fair value 2,956  
After five years through ten years, amortized cost 15,317  
After five years through ten years, estimated fair value 15,936  
After ten years, amortized cost 115,531  
After ten years, estimated fair value 118,225  
Total securities with single maturity date, amortized cost 133,521  
Total securities with single maturity date, estimated fair value 137,117  
Debt securities, amortized cost 434,162  
Available-for-sale investment securities 441,223 443,224
Held-to-maturity Securities    
Ten Years, Amortized Cost 31,711  
Ten Years, Estimated Fair Value 33,666  
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 17,286  
Investment securities not due at a single maturity date, estimated fair value 17,336  
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 272,082  
Investment securities not due at a single maturity date, estimated fair value 274,102  
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 3,677  
Investment securities not due at a single maturity date, estimated fair value 5,035  
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 $ 7,633