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Other Real Estate Owned (Tables)
12 Months Ended
Dec. 31, 2017
Other Real Estate Owned [Abstract]  
Summary of activity of real estate acquired in settlement of loans portion of other real estate owned
    
For the year ended December 31,
(dollars in thousands)     2017     2016
Balance, beginning of year                         $639$2,475
Additions289245
Sales(501)(1,615)
Write-downs, net(185)(466)
Balance, end of year$242$639