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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Troubled Debt Restructuring (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) contract | Mar. 31, 2020 contract | Dec. 31, 2020 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 9,685 |  | $ 9,716
Specific reserves on TDRs | $ 0 |  | $ 0
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract | 1 | 0 | 4
Pre-Modification Outstanding Recorded Investment | $ 17 |  | $ 2,435
Post-Modification Outstanding Recorded Investment | $ 17 |  | $ 1,836
Commercial and industrial |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract | 1 |  | 1
Pre-Modification Outstanding Recorded Investment | $ 17 |  | $ 129
Post-Modification Outstanding Recorded Investment | 17 |  | $ 85
Construction and development |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract |  |  | 2
Pre-Modification Outstanding Recorded Investment |  |  | $ 1,289
Post-Modification Outstanding Recorded Investment |  |  | $ 1,081
Commercial real estate |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract |  |  | 1
Pre-Modification Outstanding Recorded Investment |  |  | $ 1,017
Post-Modification Outstanding Recorded Investment |  |  | 670
Nonaccrual TDRs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Total | 87 |  | 90
Performing TDRs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 9,598 |  | $ 9,626

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