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Investment Securities - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 0 $ 0
Within one year, estimated fair value 0 0
After one year through five years, amortized cost 15,145 12,297
After one year through five years, estimated fair value 15,484 12,695
After five years through ten years, amortized cost 35,667 37,376
After five years through ten years, estimated fair value 35,614 38,397
After ten years, amortized cost 237,731 132,112
After ten years, estimated fair value 239,201 137,176
Total securities with single maturity date, amortized cost 288,543 181,785
Total securities with single maturity date, estimated fair value 290,299 188,268
Debt securities, amortized cost 548,640 470,080
Available-for-sale investment securities 547,749 477,554
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Within one year, amortized cost   0
Within one year, estimated fair value   0
After one year through five years, amortized cost   0
After one year through five years, estimated fair value   0
After five years through ten years, amortized cost   0
After five years through ten years, estimated fair value   0
After ten years, amortized cost   31,712
After ten years, estimated fair value   35,142
Total securities with single maturity date, amortized cost   31,712
Total securities with single maturity date, estimated fair value 0 35,142
Investment securities not due at a single maturity date, amortized cost   31,712
Investment securities not due at a single maturity date, 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 69,005 52,803
Investment securities not due at a single maturity date, estimated fair value 68,970 52,901
Debt securities, amortized cost 69,005 52,803
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Investment securities not due at a single maturity date, amortized cost   0
Investment securities not due at a single maturity date, estimated fair value   0
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 181,785 225,636
Investment securities not due at a single maturity date, estimated fair value 178,221 225,259
Debt securities, amortized cost 181,785 225,636
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Investment securities not due at a single maturity date, amortized cost   0
Investment securities not due at a single maturity date, estimated fair value   0
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 1,807 2,356
Investment securities not due at a single maturity date, estimated fair value 2,843 3,590
Debt securities, amortized cost 1,807 2,356
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Investment securities not due at a single maturity date, amortized cost   0
Investment securities not due at a single maturity date, estimated fair value   0
Other equity securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 7,500 7,500
Investment securities not due at a single maturity date, estimated fair value $ 7,416 7,536
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Investment securities not due at a single maturity date, amortized cost   0
Investment securities not due at a single maturity date, estimated fair value   $ 0