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Deposits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deposit [Line Items]    
Deposits $ 1,394,331 $ 1,538,855
Deposits, average balance $ 1,459,067 $ 1,591,971
Deposits, average rate 0.74% 0.74%
Non-interest-bearing transaction accounts    
Deposit [Line Items]    
Deposits $ 277,445 $ 252,638
Deposits, average balance $ 230,907 $ 246,182
Deposits, average rate 0.00% 0.00%
Interest-bearing transaction accounts    
Deposit [Line Items]    
Deposits $ 217,625 $ 183,992
Deposits, average balance $ 226,540 $ 169,571
Deposits, average rate 0.59% 0.27%
Money market accounts    
Deposit [Line Items]    
Deposits $ 515,077 $ 627,090
Deposits, average balance $ 583,241 $ 642,784
Deposits, average rate 0.47% 0.48%
Certificates of deposit    
Deposit [Line Items]    
Deposits $ 76,199 $ 58,454
Deposits, average balance $ 56,667 $ 65,608
Deposits, average rate 1.00% 0.90%
Wholesale deposits    
Deposit [Line Items]    
Deposits $ 307,985 $ 416,681
Deposits, average balance $ 361,712 $ 467,826
Deposits, average rate 1.70% 1.62%