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Deposits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deposit [Line Items]    
Deposits $ 1,538,855 $ 1,577,231
Deposits, average balance $ 1,591,971 $ 1,496,982
Deposits, average rate 0.74% 0.73%
Non-interest-bearing transaction accounts    
Deposit [Line Items]    
Deposits $ 252,638 $ 231,199
Deposits, average balance $ 246,182 $ 211,945
Deposits, average rate 0.00% 0.00%
Interest-bearing transaction accounts    
Deposit [Line Items]    
Deposits $ 183,992 $ 165,921
Deposits, average balance $ 169,571 $ 125,558
Deposits, average rate 0.27% 0.24%
Money market accounts    
Deposit [Line Items]    
Deposits $ 627,090 $ 612,642
Deposits, average balance $ 642,784 $ 602,842
Deposits, average rate 0.48% 0.55%
Certificates of deposit    
Deposit [Line Items]    
Deposits $ 58,454 $ 79,986
Deposits, average balance $ 65,608 $ 106,177
Deposits, average rate 0.90% 0.78%
Wholesale deposits    
Deposit [Line Items]    
Deposits $ 416,681 $ 487,483
Deposits, average balance $ 467,826 $ 450,460
Deposits, average rate 1.62% 1.43%