Regulatory Matters - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Regulated Operations [Abstract]
Trust-preferred securities included in Tier 1 capital	$ 25.8
Additional dividends without obtaining prior approval from bank regulators declared and paid		$ 160.3
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
Trust preferred securities redemption date	Jun. 15, 2021

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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-Topic 942
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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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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 Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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