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LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR, Recorded Investment and Number of Modifications (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) 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 | 6 |
Pre-Modification Outstanding Recorded Investment |  | $ 130 |
Post-Modification Outstanding Recorded Investment |  | $ 501 |
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 |  | $ 467 |
Forbearance and interest only payments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Modifications | loan |  | 1 |
Post-Modification Outstanding Recorded Investment |  | $ 25 |
Maturity concession |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Modifications | loan |  | 1 |
Post-Modification Outstanding Recorded Investment |  | $ 9 |
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 |  | $ 25 |
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 |  | $ 259 |
Total commercial and industrial | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Modifications | loan |  | 3 |
Pre-Modification Outstanding Recorded Investment |  | $ 41 |
Post-Modification Outstanding Recorded Investment |  | $ 208 |
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 | $ 343 |  | $ 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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- Definition Represents the reasonable period of a borrower's sustained repayment performance for consideration of returning the loan to performing status. + References No definition available. + Details
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