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GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 | Aug. 30, 2019 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  | $ (790) | $ 0 | $ 63,000
Intangible assets amortization |  |  | $ 2,914 | $ 2,479 |
Core deposits |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets amortization method |  |  | accelerated basis |  |
Estimated weighted average life (in years) |  |  | 6 years |  |
Customer lists |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets amortization method |  |  | straight-line basis |  |
Estimated weighted average life (in years) | 12 years | 11 years |  |  |
Customer lists | Summit Funding Group |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 30,100 |  | $ 29,500 |  | 30,100
Customer lists | Bannockburn [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 31,100 |  | $ 30,200 |  | $ 31,100

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- Definition Amount after 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 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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