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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - Non-recurring - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | $ 2,911 | $ 3,500
Capitalized servicing rights | 6,991 | 6,764
Premises held for sale | 1,154 | 1,154
Total | 11,056 | 11,418
Quoted prices for similar loans in active markets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | 2,254 | 2,437
Discount Cash Flows |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | $ 657 | $ 1,063
Impaired loans | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 0.00% | 10.00%
Appraised value | $ 215 | $ 80
Cash flows | $ 320 | $ 2
Discount rate | 3.25% | 3.25%
Impaired loans | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 40.00% | 43.00%
Appraised value | $ 916 | $ 965
Cash flows | $ 513 | $ 520
Discount rate | 4.99% | 7.13%
Capitalized servicing rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Constant prepayment rate | 6.87% | 7.20%
Discount rate | 10.06% | 10.06%
Assets held for sale |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Premises held for sale | $ 1,154 | $ 1,154
Selling Costs | 6.00% | 6.00%
Assets held for sale | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | $ 1,223 | $ 1,223

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