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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Jan. 01, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Percentage Of Increase In ACL Adjusted In Capital Measures |  | 25.00%
Commercial And Financial Standby Letters Of Credit [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Commitments | $ 129.9 |
Commitments To Extend Credit [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Commitments | 2,000.0 |
Commitments To Extend Credit [Member] | Credit Card [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Commitments | 1,100.0 |
Retained Earnings [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Cummulative Effect Of New Accounting Principle In Period Of Adoption Adjusted In Capital Measures | $ 69.6 |
Basel III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Conservation Buffer | 2.50% |
Basel III [Member] | Minimum [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Capital To Risk Weight Assets Ratio Capital Adequacy | 4.50% |
Common Equity Tier1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer | 7.00% |
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 6.0 |
Total Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer | 8.50% |
Capital Required For Capital Adequacy To Risk Weighted Assets | 8.0 |
Capital Required For Capital Adequacy To Risk Weighted Assets Plus Common Equity Tier 1 Capital Conservation Buffer | 10.50% |
Leverage Ratio Required Fo Capital Adequacy Ratio | 4 |

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- Definition Common Equity Tier 1 capital divided by risk weighted assets for capital adequacy as defined by new Basel III rule. + References No definition available. + Details
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- Definition In order to avoid limitations on capital distributions and certain discretionary bonus payments, banking organizations will be requiered to hold a specific amount of excess of their minimum risk-based capital ratios. + References No definition available. + Details
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- Definition Minimun Tier 1 capital to risk weight assets for capital adequacy purposes plus capital conservation buffer as required by Basel III rule. + References No definition available. + Details
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- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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