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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of contractual amount of off-balance-sheet financial instruments
    June 30,     December 31,  
(in thousands)    2018      2017  
Commitments to extend credit   $ 235,159     $ 238,527  
Commitments to originate residential first and second mortgage loans     2,554       1,471  
Standby letters of credit     77,276       74,004  
Total     314,989       314,002