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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Troubled Debt Restructuring (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Contract | Dec. 31, 2020 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |
Total | $ 9,606 | $ 9,716
Troubled Debt Restructurings: |  |
Number of Contracts | Contract | 1 | 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 | 84 | 90
Performing TDRs |  |
Financing Receivable, Modifications [Line Items] |  |
Total | $ 9,522 | $ 9,626

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