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GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Finite Lived Intangible Assets [Line Items] |  |
Net carrying amount | $ 32,689 | $ 40,893
Core Deposits [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross amount | 87,544 | 87,096
Accumulated amortization | (57,050) | (51,254)
Net carrying amount | $ 30,494 | $ 35,842
Remaining amortization period | 8 years 3 months 18 days | 9 years
Customer Relationships [Member] | Credit Card [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross amount | $ 28,265 | $ 28,265
Accumulated amortization | (26,273) | (23,532)
Net carrying amount | $ 1,992 | $ 4,733
Remaining amortization period | 1 year 10 months 24 days | 2 years 8 months 12 days
Customer Relationships [Member] | Insurance Customer Intangible [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross amount | $ 1,067 | $ 1,067
Accumulated amortization | 864 | 749
Net carrying amount | $ 203 | $ 318
Remaining amortization period | 1 year 3 months 18 days | 2 years 1 month 6 days

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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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- Definition Amount before 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 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 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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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 + Details
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