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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
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 15,359  
After one year through five years, estimated fair value 16,027  
After five years through ten years, amortized cost 42,334  
After five years through ten years, estimated fair value 44,764  
After ten years, amortized cost 169,628  
After ten years, estimated fair value 181,417  
Total securities with single maturity date, amortized cost 227,321  
Total securities with single maturity date, estimated fair value 242,208  
Debt securities, amortized cost 533,044  
Available-for-sale investment securities 551,075 $ 477,554
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 48,007  
Investment securities not due at a single maturity date, estimated fair value 48,266  
Debt securities, amortized cost 48,007 52,803
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 248,321  
Investment securities not due at a single maturity date, estimated fair value 249,966  
Debt securities, amortized cost 248,321 225,636
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 1,895  
Investment securities not due at a single maturity date, estimated fair value 2,959  
Debt securities, amortized cost 1,895 $ 2,356
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 $ 7,676