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GOODWILL AND OTHER INTANGIBLES - Goodwill by Segment (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |
Goodwill | $ 38,632 | $ 28,098
Mergers and acquisitions |  | 6,303
Measurement period adjustments | (21) | 4,231
Goodwill | 38,611 | 38,632
Mortgage Banking [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 959 | 0
Mergers and acquisitions |  | 574
Measurement period adjustments | 53 | 385
Goodwill | 1,012 | 959
Consumer Retail Banking Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 2,733 | 1,406
Mergers and acquisitions |  | 794
Measurement period adjustments | 74 | 533
Goodwill | 2,807 | 2,733
Commercial And Corporate Banking Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 8,248 | 0
Mergers and acquisitions |  | 4,935
Measurement period adjustments | (148) | 3,313
Goodwill | 8,100 | 8,248
United States Operations Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 26,692 | 26,692
Mergers and acquisitions |  | 0
Measurement period adjustments | 0 | 0
Goodwill | $ 26,692 | $ 26,692

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