Regulation and Capital Adequacy - Risk-Based Capital and Leverage Ratios and "Well-capitalized" Requirements (Detail)	Sep. 30, 2025	Dec. 31, 2024
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio	0.040	0.040
"Well-capitalized" Requirements, SLR	0.050	0.050
Advanced
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital ratio	0.080	0.080
CET1 capital ratio	0.045	0.045
Tier 1 capital ratio	0.060	0.060
Capital conservation buffer	0.025	0.025
Counter-cyclical capital buffer	0	0
Reportable Legal Entities
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital ratio	7.00%	7.00%
Tier 1 capital ratio	8.50%	8.50%
Total capital ratio	0.105	0.105
Tier 1 leverage ratio	0.040	0.040
Requirements, SLR	3.00%	3.00%
"Well Capitalized" Requirements, CET 1 capital ratio	0.065	0.065
"Well-capitalized" Requirements, Tier 1 capital ratio	0.080	0.080
"Well-capitalized" Requirements, Total capital ratio	0.100	0.100
"Well-capitalized" Requirements, Tier 1 leverage ratio	0.050	0.050
"Well-capitalized" Requirements, SLR	0.060	0.060
CET1 capital ratio	0.045	0.045
Tier 1 capital ratio	0.060	0.060
Minimum required capital ratio, advanced	8.00%	8.00%
Reportable Legal Entities \| Advanced
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	0.025	0.025

Minimum Required Common Equity Tier One Capital Ratio Applicable To Advanced Approach Banking Institutions

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Minimum required Tier One capital ratio applicable to advanced approach banking institutions.

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Minimum Required Total Capital Ratio Applicable To Advanced Approach Banking Institutions

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Required Supplementary Tier One Leverage Ratio For Insured Depository Institutions That are Subsidiaries of Bank Holding Companies.

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Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework.

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Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Countercyclical capital buffer percentage as defined by regulatory framework.

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Ratio of minimum Tier 1 risk-based capital to total leverage exposure categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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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.

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Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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