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LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in impaired loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment $ 1,835 $ 5,348 $ 1,835
Recorded Investment With No Allowance   3,459  
Recorded Investment With Allowance 1,835 1,889 1,835
Allowance for Loan Losses 1,040 459 722
Unpaid Contractual Principal Balance 1,835 5,348 1,835
Average Recorded Investment 1,835 5,443 1,066
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment 1,835 5,348 1,835
Recorded Investment With No Allowance   3,459  
Recorded Investment With Allowance 1,835 1,889 1,835
Allowance for Loan Losses 1,040 459 722
Unpaid Contractual Principal Balance 1,835 5,348 1,835
Average Recorded Investment $ 1,835 $ 5,443 $ 1,066