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LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR, Recorded Investment and Number of Modifications (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Borrower's sustained repayment performance period |  |  | 6 months |  |
Number of Modifications | 0 | 1 | 0 | 7 |
Pre-Modification Outstanding Recorded Investment |  | $ 86 |  | $ 216 |
Post-Modification Outstanding Recorded Investment | $ 528 | $ 86 |  | $ 528 |
Number of modifications which subsequently defaulted | loan | 0 |  |  |  |
Interest rate, forbearance and maturity concession |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan | 4 |  |  |  |
Post-Modification Outstanding Recorded Investment | $ 409 |  |  |  |
Forbearance and interest only payments |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan | 1 |  |  |  |
Post-Modification Outstanding Recorded Investment | $ 24 |  |  |  |
Maturity concession |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan | 2 |  |  |  |
Post-Modification Outstanding Recorded Investment | $ 95 |  |  |  |
Home equity |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan |  |  |  | 1 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 26 |
Post-Modification Outstanding Recorded Investment |  |  |  | $ 24 |
Total commercial loans | Commercial construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan |  | 1 |  |  |
Pre-Modification Outstanding Recorded Investment |  | $ 86 |  |  |
Post-Modification Outstanding Recorded Investment |  | $ 86 |  |  |
Total commercial real estate | Commercial real estate non-owner occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan |  |  |  | 1 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 54 |
Post-Modification Outstanding Recorded Investment |  |  |  | $ 247 |
Total commercial and industrial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan |  |  |  | 4 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 127 |
Post-Modification Outstanding Recorded Investment |  |  |  | $ 248 |
Total residential real estate | Residential mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Residential mortgage loans collateralized by real estate property in the process of foreclosure |  |  | $ 734 |  | $ 917
Total consumer | Consumer other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Modifications | loan |  |  |  | 1 |
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 9 |
Post-Modification Outstanding Recorded Investment |  |  |  | $ 9 |

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