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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, 2022 | Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | $ 6,874 | $ 8,324
Capitalized servicing rights | 6,778 | 5,263
Premises held for sale | 327 | 226
Total | 13,979 | 13,813
Quoted prices for similar loans in active markets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | 3,135 | 4,780
Discount Cash Flows |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | $ 3,739 | $ 3,544
Impaired loans | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 10.00% | 10.00%
Appraised value | $ 71 | $ 71
Cash flows | $ 5 | $ 6
Discount rate | 2.88% | 2.88%
Impaired loans | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 70.00% | 70.00%
Appraised value | $ 1,175 | $ 1,792
Cash flows | $ 943 | $ 931
Discount rate | 6.45% | 9.50%
Capitalized servicing rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Constant prepayment rate (CPR) | 8.31% | 12.47%
Discount rate | 9.05% | 9.53%
Assets held for sale |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Premises held for sale | $ 327 | $ 226
Selling Costs | 6.00% | 6.00%
Assets held for sale | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | $ 347 | $ 240

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