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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Tables)
 12 Months Ended
Dec. 31, 2020
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)20202019
Home Equity$88,672 $87,327 
Commercial Operating Lines508,602 358,561 
Other Commitments119,108 105,872 
TOTAL$716,382 $551,760 
Commercial letters of credit$3,601 $3,851