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Investment Securities - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 1,893 $ 0
Within one year, estimated fair value 1,914 0
After one year through five years, amortized cost 7,149 15,145
After one year through five years, estimated fair value 7,316 15,484
After five years through ten years, amortized cost 22,043 35,667
After five years through ten years, estimated fair value 22,696 35,614
After ten years, amortized cost 105,870 237,731
After ten years, estimated fair value 111,179 239,201
Total securities with single maturity date, amortized cost 136,955 288,543
Total securities with single maturity date, estimated fair value 143,105 290,299
Debt securities, amortized cost 538,692 548,640
Available-for-sale investment securities 542,704 547,749
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 65,994 69,005
Investment securities not due at a single maturity date, estimated fair value 66,587 68,970
Debt securities, amortized cost 65,994 69,005
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 237,210 181,785
Investment securities not due at a single maturity date, estimated fair value 234,908 178,221
Debt securities, amortized cost 237,210 181,785
Private label residential mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 91,033 1,807
Investment securities not due at a single maturity date, estimated fair value 90,681 2,843
Debt securities, amortized cost 91,033 1,807
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 $ 7,423 $ 7,416