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GOODWILL AND INTANGIBLE ASSETS - Acquired intangible assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Balance Acquired | $ 11,608 | $ 11,608
Accumulated Amortization | 11,604 | 11,593
Core deposit intangibles |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Balance Acquired | 5,975 | 5,975
Accumulated Amortization | 5,975 | 5,974
Other customer relationship intangibles |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Balance Acquired | 5,633 | 5,633
Accumulated Amortization | $ 5,629 | $ 5,619

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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