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LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in impaired loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment $ 13,112 $ 1,868 $ 1,835
Recorded Investment With No Allowance 11,277    
Recorded Investment With Allowance 1,835 1,868 1,835
Allowance for Loan Losses 1,040 459 722
Unpaid Contractual Principal Balance 13,112 1,868 1,835
Average Recorded Investment 13,223 1,884 1,066
Cash, Securities and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment 11,277    
Recorded Investment With No Allowance 11,277    
Unpaid Contractual Principal Balance 11,277    
Average Recorded Investment 11,388    
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment 1,835 1,868 1,835
Recorded Investment With Allowance 1,835 1,868 1,835
Allowance for Loan Losses 1,040 459 722
Unpaid Contractual Principal Balance 1,835 1,868 1,835
Average Recorded Investment $ 1,835 $ 1,884 $ 1,066