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GOODWILL AND OTHER INTANGIBLES - Goowill by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Beginning balance |  | $ 38,632 | $ 28,098
Merger and acquisitions |  |  | 6,303
Adjustments | $ 4,200 | (21) | 4,231
Ending balance | 38,632 | 38,611 | 38,632
Mortgage Banking [Member] |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 959 | 0
Merger and acquisitions |  |  | 574
Adjustments |  | 53 | 385
Ending balance | 959 | 1,012 | 959
Consumer Retail Banking Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 1,327 | 0
Merger and acquisitions |  |  | 794
Adjustments |  | 74 | 533
Ending balance | 1,327 | 1,401 | 1,327
Commercial And Corporate Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 8,248 | 0
Merger and acquisitions |  |  | 4,935
Adjustments |  | (148) | 3,313
Ending balance | 8,248 | 8,100 | 8,248
United States Operations Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 28,098 | 28,098
Merger and acquisitions |  |  | 0
Adjustments |  | 0 | 0
Ending balance | $ 28,098 | $ 28,098 | $ 28,098

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