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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Tables)
 12 Months Ended
Dec. 31, 2017
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)
 
2017
 
2016
Home Equity
 
$
57,060

 
$
55,362

Commercial Operating Lines
 
246,855

 
268,577

Other Commitments
 
83,786

 
66,408

TOTAL
 
$
387,701

 
$
390,347

Commercial letters of credit
 
$
5,012

 
$
5,673