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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Amortized Cost Basis of Collateral-dependent Loans (Details) - Collateral Dependent Loans - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 5,268 | $ 10,727
Allowance for Credit Losses Allocation | 850 | 2,300
Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 5,268 | 10,727
Commercial and industrial |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 119 | 129
Allowance for Credit Losses Allocation | 40 | 44
Commercial and industrial | Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 119 | 129
Construction and development |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 609 | 609
Allowance for Credit Losses Allocation | 207 | 208
Construction and development | Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 609 | 609
Commercial real estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 4,540 | 9,989
Allowance for Credit Losses Allocation | 603 | 2,048
Commercial real estate | Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 4,540 | $ 9,989

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