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FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2017
Investments, All Other Investments [Abstract]  
Financial instrument liabilities with off-balance sheet credit risk
December 31, (dollars in thousands)    2017      2016  
Residential  $16,769   $6,150 
Home equity lines of credit   29,031    26,491 
Commercial   26,145    5,624 
Land   64    116 
Real estate secured   72,009    38,381 
Commercial and industrial   63,942    56,178 
Municipal   188    250 
Consumer   1,574    1,464 
Unadvanced portions of loans   137,713    96,273 
Commitments to originate loans   28,222    30,428 
Letters of credit   4,905    1,112 
Total  $170,840   $127,813