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Loans - Troubled Debt Restructuring (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Financing Receivable, Impaired [Line Items]          
Average recorded investment $ 3,810 $ 665 $ 3,203 $ 1,695  
Impaired financing receivable, related allowance 447   447   $ 332
Loans receivable, nonaccrual status $ 6,195   $ 6,195   2,994
Number of loans modified as a TDR | loan 0 0 0 0  
Number of loans with subsequent default | loan 0   0    
Troubled Debt Restructuring (TDR)          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     $ 755   786
Impaired financing receivable, related allowance $ 107   $ 107   $ 138