Regulatory Capital Requirements - Additional Information (Detail)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer, percentage of common equity Tier 1 capital to risk-weighted assets	2.50%
FDIC
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio	0.0400	0.0400
Common equity Tier 1 capital to risk-based assets ratio	4.50%	4.50%
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio	0.060	0.0600
Total risk-based capital, minimum capital adequacy requirements, Ratio	0.0800	0.0800
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Ratio	0.0500	0.0500
Common equity Tier 1 risk-based capital ratio	6.50%	6.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio	0.0800	0.0800
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio	0.1000	0.1000

Capital Conservation Buffer, Percentage of Common equity Tier 1 Capital to Risk-Weighted Assets

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- Definition

Common Equity Tier One Capital to Average Assets for Capital Adequacy

+ References

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- Definition

Common Equity Tier One Capital to Average Assets to be Well Capitalized

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

+ References

Reference 1: 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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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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- Definition

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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