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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Level 3 (Details) - Level 3 - Servicing rights - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Level 3 |  |  |  |
Servicing rights balance, beginning of period | $ 1,284 | $ 1,322 | $ 1,277 | $ 1,404
Originations of servicing rights | 374 | 70 | 777 | 136
Unrealized losses included in earnings | (221) | (164) | (617) | (312)
Servicing rights balance, end of period | $ 1,437 | $ 1,228 | $ 1,437 | $ 1,228

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