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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of contractual amount of off-balance-sheet financial instruments
    March 31,     December 31,  
(in thousands)   2018     2017  
Commitments to extend credit   $ 228,595     $ 238,527  
Commitments to originate residential first and second mortgage loans     3,490       1,471  
Standby letters of credit     76,479       74,004  
Total     308,564       314,002