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Regulatory Matters - Additional Information (Detail) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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 |

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- Definition Trust preferred securities included in tier one capital. + References No definition available. + Details
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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 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 + Details
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