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FAIR VALUE MEASUREMENTS - Measured on Non-recurring Basis (Details) - Non-recurring - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Assets |  |  |
Liabilities measured at fair value |  | $ 0 | $ 0
Level 3 |  |  |
Assets |  |  |
Individually evaluated loans | $ 2,911,000 | 3,500,000 |
Capitalized servicing rights | 6,991,000 | 6,764,000 |
Premises held for sale | 1,154,000 | 1,154,000 |
Total | 11,056,000 | 11,418,000 |
Total Gains (Losses) | (362,000) |  |
Level 3 | Impaired loans |  |  |
Assets |  |  |
Total Gains (Losses) | (589,000) |  |
Level 3 | Capitalized servicing rights |  |  |
Assets |  |  |
Total Gains (Losses) | 227,000 |  |
Level 3 | Assets held for sale |  |  |
Assets |  |  |
Premises held for sale | 1,154,000 | $ 1,154,000 |
Total Gains (Losses) | $ 0 |  |

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