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Capital - Actual Capital Amounts and Ratios for Commercial Bank in Comparison With Minimum Amounts and Ratios Required (Detail) - Bank - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Common Equity, Tier 1 Amount |  |
Total regulatory capital, Common Equity, Tier 1 Amount | $ 4,964,055 | $ 4,785,217
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount | 1,834,112 | 1,733,085
Excess, Common Equity, Tier 1 Amount | $ 3,129,943 | $ 3,052,132
Common Equity, Tier 1 Ratio |  |
Total regulatory capital, Common Equity, Tier 1 Ratio | 12.18% | 12.42%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio | 4.50% | 4.50%
Excess, Common Equity, Tier 1 Ratio | 7.68% | 7.92%
Risk-Based Capital, Tier 1 Amount |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Amount | $ 4,964,055 | $ 4,785,217
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount | 2,445,483 | 2,310,780
Excess, Risk-Based Capital, Tier 1 Amount | $ 2,518,572 | $ 2,474,437
Risk-Based Capital, Tier 1 Ratio |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio | 12.18 | 12.42
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio | 6.00 | 6.00
Excess, Risk-Based Capital, Tier 1 Ratio | 6.18 | 6.42
Risk-Based Capital, Total Amount |  |
Total regulatory capital, Risk-Based Capital, Total Amount | $ 5,145,321 | $ 4,933,900
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount | 3,260,643 | 3,081,040
Excess, Risk-Based Capital, Total Amount | $ 1,884,678 | $ 1,852,860
Risk-Based Capital, Total Ratio |  |
Total regulatory capital, Risk-Based Capital, Total Ratio | 12.62 | 12.81
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio | 8.00 | 8.00
Excess, Risk-Based Capital, Total Ratio | 4.62 | 4.81
Leverage Capital, Amount |  |
Total regulatory capital, Leverage Capital, Amount | $ 4,964,055 | $ 4,785,217
Minimum for capital adequacy purposes, Leverage Capital, Amount | 2,095,175 | 1,996,288
Excess, Leverage Capital, Amount | $ 2,868,880 | $ 2,788,929
Leverage Capital, Ratio |  |
Total regulatory capital, Leverage Capital, Ratio | 9.48 | 9.59
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00 | 4.00
Excess, Leverage Capital, Ratio | 5.48 | 5.59

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