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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - Non-recurring - Level 3 - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | $ 9,247 | $ 8,746
Capitalized servicing rights | 4,867 | 3,605
Premises held for sale | 822 | 962
Total | 14,936 | 13,313
Premises held for sale, carrying value | 822,000 |
Fair value of collateral -appraised value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | 6,226 | 6,128
Discount cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Individually evaluated loans | $ 3,021 | $ 2,618
Impaired loans | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 10.00% | 0.00%
Appraised value | $ 71 | $ 0
Cash flows | $ 6 | $ 19
Discount rate | 2.88% | 3.50%
Impaired loans | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Loss severity | 70.00% | 70.00%
Appraised value | $ 1,792 | $ 1,730
Cash flows | $ 939 | $ 953
Discount rate | 9.50% | 9.50%
Capitalized servicing rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Constant prepayment rate (CPR) | 13.66% | 18.53%
Discount rate | 9.53% | 10.05%
Assets held for sale |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Premises held for sale | $ 822 | $ 962
Selling Costs | 6.00% | 6.00%
Assets held for sale | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | $ 220 | $ 220
Assets held for sale | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items} |  |
Appraised value | $ 386 | $ 386

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