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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Tables)
 12 Months Ended
Dec. 31, 2018
Risks and Uncertainties [Abstract]  
Summary of Commitment and Contingent Liabilities
Commitment and contingent liabilities are summarized as follows at December 31:
(Dollar amounts in thousands)
 
2018
 
2017
Home Equity
 
$
57,341

 
$
57,060

Commercial Operating Lines
 
285,524

 
246,855

Other Commitments
 
81,593

 
83,786

TOTAL
 
$
424,458

 
$
387,701

Commercial letters of credit
 
$
4,673

 
$
5,012