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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) bank customer | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) bank | Sep. 30, 2021 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Third-party broker | bank | 14 |  |  |
Swap fee income | $ 953,000 | $ 53,000 |  |
Cash collateral held by counterparty for derivatives | 0 |  | $ 260,000 |
Cash collateral held from counterparties | $ 2,600,000 |  | $ 490,000 |
Interest rate derivative |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of derivatives | bank | 0 |  | 0 |
Swap fee income | $ 953,000 | $ 0 |  |
Interest rate derivative | Designated as hedging instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount |  |  |  | $ 50,000,000
Interest rate derivative | Derivatives not designated as hedging instruments: |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of customers | customer | 14 |  |  |
Derivative, notional amount | $ 120,600,000 |  | $ 75,800,000 |
Interest rate derivative | Derivatives not designated as hedging instruments: | Other Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount | 60,279,000 |  | 37,915,000 |
Risk participation agreement | Agent Bank |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Upfront fee from derivative |  |  | 53,000 |
Risk participation agreement | Derivatives not designated as hedging instruments: | Other Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount | 15,855,000 |  | 15,855,000 |
Risk participation agreement | Derivatives not designated as hedging instruments: | Agent Bank | Other Liabilities |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount | $ 15,900,000 |  | $ 15,900,000 |

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