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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of maximum potential obligations to extend credit for loan commitments
The Company’s maximum potential obligations to extend credit for loan commitments (unfunded loans, unused lines of credit, and standby letters of credit) outstanding on December 31 were as follows:
 
(in thousands)
2017
 
2016
Loan commitments
$
148,611

 
$
125,472

Standby letters of credit
27,805

 
57,723

Undisbursed portion of lines of credit
815,188

 
773,893

Total
$
991,604

 
$
957,088