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Investment Securities - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 0 $ 1,893
Within one year, estimated fair value 0 1,914
After one year through five years, amortized cost 2,769 7,149
After one year through five years, estimated fair value 2,899 7,316
After five years through ten years, amortized cost 21,831 22,043
After five years through ten years, estimated fair value 22,278 22,696
After ten years, amortized cost 55,286 105,870
After ten years, estimated fair value 56,327 111,179
Total securities with single maturity date, amortized cost 79,886 136,955
Total securities with single maturity date, estimated fair value 81,504 143,105
Debt securities, amortized cost 470,162 531,192
Available-for-sale investment securities 463,905 535,281
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 21,723 65,994
Investment securities not due at a single maturity date, estimated fair value 21,321 66,587
Debt securities, amortized cost 21,723 65,994
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 239,388 237,210
Investment securities not due at a single maturity date, estimated fair value 234,930 234,908
Debt securities, amortized cost 239,388 237,210
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 129,165 91,033
Investment securities not due at a single maturity date, estimated fair value 126,150 90,681
Debt securities, amortized cost $ 129,165 $ 91,033