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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of contractual amount of off-balance-sheet financial instruments
    September 30,     December 31,  
(in thousands)   2017     2016  
Commitments to extend credit   $ 212,420     $ 253,375  
Commitments to originate residential first and second mortgage loans     2,597       2,626  
Standby letters of credit     29,123       2,745  
Total   $ 244,140     $ 258,746