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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Level 3 Reconciliation (Details) - Level 3 - Servicing rights. - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reconciliation of activity for Level 3 assets (servicing rights) measured at fair value on a recurring basis |  |  |  |
Servicing rights balance, beginning of period | $ 2,429 | $ 1,956 | $ 2,329 | $ 1,689
Originations of servicing rights | 61 | 199 | 159 | 391
Unrealized gain (loss) included in earnings | 150 | (39) | 152 | 36
Servicing rights balance, end of period | $ 2,640 | $ 2,116 | $ 2,640 | $ 2,116

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