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LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in impaired loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment $ 17,500 $ 1,835 $ 17,835
Recorded Investment With No Allowance 16,065   16,100
Recorded Investment With Allowance 1,435 1,835 1,735
Allowance for Loan Losses 940 722 940
Unpaid Contractual Principal Balance 17,500 1,835 17,835
Average Recorded Investment 17,667 1,835 10,326
Interest Income Recognized 120   34
Cash, Securities and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment 10,977   11,252
Recorded Investment With No Allowance 10,977   11,252
Unpaid Contractual Principal Balance 10,977   11,252
Average Recorded Investment 11,114   4,506
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Recorded Investment 6,523 1,835 6,583
Recorded Investment With No Allowance 5,088   4,848
Recorded Investment With Allowance 1,435 1,835 1,735
Allowance for Loan Losses 940 722 940
Unpaid Contractual Principal Balance 6,523 1,835 6,583
Average Recorded Investment 6,553 $ 1,835 5,820
Interest Income Recognized $ 120   $ 34