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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of contractual amount of off-balance-sheet financial instruments
(in thousands)
    
2017
    
2016
  
Commitments to extend credit       $ 238,527         $ 253,375    
Commitments to originate residential first and second mortgage loans         1,471           2,626    
Standby letters of credit         74,004           2,745    
Total
       $  314,002         $  258,746