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GOODWILL AND OTHER INTANGIBLE ASSETS - Components of Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 8,415 | $ 8,415
Accumulated Amortization | 3,929 | 2,957
Core deposit intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 8,390 | 8,390
Accumulated Amortization | 3,906 | 2,935
Other customer relationship intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 25 | 25
Accumulated Amortization | $ 23 | $ 22

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