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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Derivative Financial Instruments [Abstract]  
Schedule of outstanding financial derivative instruments
    
December 31, 2017
Fair Value
(dollars in thousands)     Notional     Balance Sheet Location     Asset/(Liability)
Mortgage loan interest rate lock commitments$15,430Other assets            $196
MBS forward sales commitments10,750Other liabilities(28)
Total derivative financial instruments$26,180$168
          
December 31, 2016
Fair Value
     Notional     Balance Sheet Location     Asset/(Liability)
Mortgage loan interest rate lock commitments$17,986Other assets           $256
MBS forward sales commitments14,250Other liabilities(3)
Total derivative financial instruments$32,236$253