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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 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 2,667  
After one year through five years, estimated fair value 2,947  
After five years through ten years, amortized cost 14,968  
After five years through ten years, estimated fair value 15,287  
After ten years, amortized cost 106,043  
After ten years, estimated fair value 106,280  
Total securities with single maturity date, amortized cost 123,678  
Total securities with single maturity date, estimated fair value 124,514  
Debt securities, amortized cost 419,372  
Available-for-sale investment securities 422,073 443,224
Held-to-maturity Securities    
Ten Years, Amortized Cost 31,589  
Ten Years, Estimated Fair Value 32,047  
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 17,968  
Investment securities not due at a single maturity date, estimated fair value 17,975  
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 266,173  
Investment securities not due at a single maturity date, estimated fair value 266,825  
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 3,957  
Investment securities not due at a single maturity date, estimated fair value 5,211  
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 $ 7,548