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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Feb. 28, 2023 | Jul. 31, 2022 | Mar. 31, 2022 | Oct. 31, 2018
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |  |  |  |
USD-Prime rate |  | 8.50% |  |  |  |  |  |
USD-SOFR OIS rate |  | 5.3224% |  |  |  |  |  |
Non-interest income related to changes in the fair value |  | $ 0 | $ 0 |  |  |  |  |
Interest rate swaps | Cash flow hedges |  |  |  |  |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |  |  |  |
Total notional amount of the swaps |  |  |  |  |  |  | $ 300,000,000 | $ 400,000,000
Derivative, fixed interest rate |  |  |  |  |  |  | 1.6725% | 3.018%
Terminated notional amount of derivatives | $ 400,000,000 |  |  |  |  |  |  |
Expected interest income on termination | $ 45,900,000 |  |  |  |  |  |  |
Loan interest income on terminated interest rate swap |  | 2,000,000.0 | 2,000,000.0 |  |  |  |  |
Terminated interest rate swap |  | 1,900,000 | $ 2,200,000 |  |  |  |  |
Interest rate swaps | Fair Value Hedges |  |  |  |  |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |  |  |  |
Total notional amount of the swaps |  |  |  |  | $ 95,000,000 |  |  |
Derivative, fixed interest rate |  |  |  |  | 4.65% |  |  |
Interest rate swap one | Cash flow hedges |  |  |  |  |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  | 2.628% |  |
Interest rate swap two | Cash flow hedges |  |  |  |  |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |  |  |  |
Total notional amount of the swaps |  |  |  |  |  | $ 200,000,000 |  |
Derivative, fixed interest rate |  |  |  |  |  | 5.725% |  |
July 2022 interest rate swaps | Cash flow hedges |  |  |  |  |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |  |  |  |  |
Loan interest income expense |  | $ 2,800,000 |  | $ 0 |  |  |  |

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