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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
loan
Mar. 31, 2017
USD ($)
Sep. 30, 2016
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
loan
Dec. 31, 2016
USD ($)
Receivables [Abstract]            
Unearned income $ 3,017     $ 3,017   $ 2,382
Loans pledged to secure borrowings $ 491,400     $ 491,400   266,600
Loans modified for troubled debt restructurings | loan 0   0 0 0  
Total TDR $ 940     $ 940   4,100
Charge off   $ 3,800        
Valuation allowance related to total TDR $ 206     $ 206   $ 2,200
Loans modified for troubled debt restructurings with subsequent payment default | loan 0   0 0 0