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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
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 11,621  
After one year through five years, estimated fair value 12,010  
After five years through ten years, amortized cost 30,472  
After five years through ten years, estimated fair value 31,322  
After ten years, amortized cost 132,665  
After ten years, estimated fair value 135,667  
Total securities with single maturity date, amortized cost 174,758  
Total securities with single maturity date, estimated fair value 178,999  
Debt securities, amortized cost 444,728  
Available-for-sale investment securities 452,842 $ 432,535
Held-to-maturity Securities    
Ten Years, Amortized Cost 32,367  
Ten Years, Estimated Fair Value 35,256  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 51,679  
Investment securities not due at a single maturity date, estimated fair value 51,914  
Debt securities, amortized cost 51,679 33,088
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 208,318  
Investment securities not due at a single maturity date, estimated fair value 210,543  
Debt securities, amortized cost 208,318 236,629
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 2,473  
Investment securities not due at a single maturity date, estimated fair value 3,745  
Debt securities, amortized cost 2,473 $ 3,079
Other equity securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 7,500  
Investment securities not due at a single maturity date, estimated fair value $ 7,641