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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
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