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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Allowance for Loan and Lease Losses) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
subsector
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
method
subsector
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounting Policies [Abstract]                      
Provision (credit) for loan and lease losses | $ $ (186) $ (126) $ (2,282) $ (80) $ (2,645) $ (743) $ (1,382) $ (747) $ (2,674) $ (5,517) $ (15,671)
Number of evaluation methods of loan and lease Allowance | method                 3    
Number of homogeneous subsectors in the loan portfolio | subsector 10               10