Regulation and Capital Adequacy - Risk-based Capital Requirements Under the Standardized and Advanced Capital Rules and the Leverage Requirements (Detail)	Sep. 30, 2020
Regulation And Capital Adequacy [Abstract]
CET1 capital ratio	9.50%
Tier 1 capital ratio	0.110
Total capital ratio	0.130
Tier 1 leverage ratio	0.040
SLR	5.00%

Regulation And Capital Adequacy.

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- Definition

Required CET1 ratio effective January 2014 applicable to advanced approach banking institutions.

+ References

No definition available.

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- Definition

Required Supplementary Tier One Leverage Ratio

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No definition available.

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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

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- Definition

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

+ References

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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.

+ References

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