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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 455  
Within one year, estimated fair value 466  
After one year through five years, amortized cost 15,656  
After one year through five years, estimated fair value 16,035  
After five years through ten years, amortized cost 41,922  
After five years through ten years, estimated fair value 42,645  
After ten years, amortized cost 207,731  
After ten years, estimated fair value 210,789  
Total securities with single maturity date, amortized cost 265,764  
Total securities with single maturity date, estimated fair value 269,935  
Debt securities, amortized cost 526,678  
Available-for-sale securities 529,240 $ 547,749
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 66,472  
Investment securities not due at a single maturity date, estimated fair value 66,538  
Debt securities, amortized cost 66,472 69,005
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 185,219  
Investment securities not due at a single maturity date, estimated fair value 182,643  
Debt securities, amortized cost 185,219 181,785
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 1,723  
Investment securities not due at a single maturity date, estimated fair value 2,708  
Debt securities, amortized cost 1,723 $ 1,807
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 $ 7,416