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FAIR VALUE MEASUREMENTS - Fair value of assets measured on a recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Assets |  |  |
Mortgage servicing rights | $ 13,356 | $ 13,668 | $ 9,582
Recurring |  |  |
Assets |  |  |
Mortgage servicing rights | 13,356 | 13,668 |
Recurring | Obligations of U.S. Government sponsored agencies |  |  |
Assets |  |  |
Securities available for sale | 27,045 | 28,294 |
Recurring | Obligations of states and political subdivisions |  |  |
Assets |  |  |
Securities available for sale | 57,566 | 58,246 |
Recurring | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale | 34,775 | 36,130 |
Recurring | Corporate notes |  |  |
Assets |  |  |
Securities available for sale | 19,034 | 19,038 |
Recurring | Certificates of deposit |  |  |
Assets |  |  |
Securities available for sale |  | 489 |
Recurring | Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Mortgage servicing rights | 13,356 | 13,668 |
Recurring | Other Observable Inputs (Level 2) | Obligations of U.S. Government sponsored agencies |  |  |
Assets |  |  |
Securities available for sale | 27,045 | 28,294 |
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |  |
Assets |  |  |
Securities available for sale | 57,566 | 58,246 |
Recurring | Other Observable Inputs (Level 2) | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale | 34,775 | 36,130 |
Recurring | Other Observable Inputs (Level 2) | Corporate notes |  |  |
Assets |  |  |
Securities available for sale | 19,034 | 19,038 |
Recurring | Other Observable Inputs (Level 2) | Certificates of deposit |  |  |
Assets |  |  |
Securities available for sale |  | 489 |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Assets at fair value | 0 | $ 0 |
Liabilities |  |  |
Liabilities at fair value | $ 0 |  |

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