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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 | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of activity for Level 3 assets (servicing rights) measured at fair value on a recurring basis |  |  |  |
Servicing rights balance, beginning of period | $ 2,116 | $ 1,284 | $ 1,689 | $ 1,277
Originations of servicing rights | 176 | 374 | 567 | 777
Unrealized (loss) gain included in earnings | (45) | (221) | (9) | (617)
Servicing rights balance, end of period | $ 2,247 | $ 1,437 | $ 2,247 | $ 1,437

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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