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Investment Securities - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 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 12,297  
After one year through five years, estimated fair value 12,695  
After five years through ten years, amortized cost 37,376  
After five years through ten years, estimated fair value 38,397  
After ten years, amortized cost 132,112  
After ten years, estimated fair value 137,176  
Total securities with single maturity date, amortized cost 181,785  
Total securities with single maturity date, estimated fair value 188,268  
Debt securities, amortized cost 470,080  
Available-for-sale investment securities 477,554 $ 432,535
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
After ten years, Amortized Cost 31,712  
After ten years, Estimated Fair Value 35,142  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 52,803  
Investment securities not due at a single maturity date, estimated fair value 52,901  
Debt securities, amortized cost 52,803 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 225,636  
Investment securities not due at a single maturity date, estimated fair value 225,259  
Debt securities, amortized cost 225,636 236,629
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 2,356  
Investment securities not due at a single maturity date, estimated fair value 3,590  
Debt securities, amortized cost 2,356 $ 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 $ 7,536