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Troubled Debt Restructurings (Tables)
3 Months Ended
Mar. 31, 2017
Troubled Debt Restructurings [Abstract]  
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification
 
For the three months ended March 31, 2017
Pre-Post-
modificationmodification
RenewalsReducedConvertedMaturityTotaloutstandingoutstanding
 deemed aor deferredto interest dateNumberrecordedrecorded
(dollars in thousands)concessionpaymentsonlyextensionsof loansinvestment investment
Commercial                                    
     Business1---1$     149$     149
          Total loans1---1$149$149