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REGULATORY MATTERS, COMMITMENTS, AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Jan. 01, 2020
Commercial And Financial Standby Letters Of Credit [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Commitments to extend credit | $ 72.1 |  |
Commitments To Extend Credit [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Commitments to extend credit | 2,000.0 |  |
Commitments To Extend Credit [Member] | Credit Card [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Commitments to extend credit | 961,100.0 |  |
ASU 2016-13 |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Percentage Of Increase In ACL Adjusted In Capital Measures |  | 25.00% | 25.00%
CECL, amount excluded to be phased-on during after two years | $ 32.4 |  |
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1 |  |  | $ (32.4)
Basel III [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Capital Conservation Buffer | 2.50% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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