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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructuring (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) contract | Mar. 31, 2019 contract | Dec. 31, 2019 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 7,317 |  | $ 7,341
Specific reserves on TDRs | $ 0 |  | $ 164
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract | 0 | 0 | 4
Pre-Modification Outstanding Recorded Investment |  |  | $ 1,680
Post-Modification Outstanding Recorded Investment |  |  | $ 1,515
Commercial real estate |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract |  |  | 4
Pre-Modification Outstanding Recorded Investment |  |  | $ 1,680
Post-Modification Outstanding Recorded Investment |  |  | 1,515
Nonaccrual TDRs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 97 |  | 101
Performing TDRs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 7,220 |  | $ 7,240

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