Regulatory Matters - Additional Information (Detail) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Regulated Operations [Abstract]
Trust-preferred securities included in Tier 1 capital	$ 25.7	$ 25.7
Additional dividends without obtaining prior approval from bank regulators declared and paid	$ 150.9
Minimum total risk based capital ratio	8.0
Minimum Tier 1 risk based capital ratio	6.0
Minimum common equity Tier 1 capital ratio	4.5
Minimum leverage ratio for Highest rated institutions	4.0
Well capitalized common equity Tier 1 capital ratio	6.5
Well capitalized Tier 1 risk based capital ratio	8.0
Well capitalized risk based capital ratio	10.0
Well capitalized leverage ratio	5.0

Additional dividends without obtaining prior approval from bank regulators declared and paid.

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- Definition

Trust preferred securities included in tier one capital.

+ References

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- Definition

Ratio of minimum Common Equity Tier 1 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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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.

+ 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)
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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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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 categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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