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Capital - Actual Capital Amounts and Ratios for Community Bank in Comparison to Minimum Amounts and Ratios Required (Detail) - Company - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Common Equity, Tier 1 Amount    
Total regulatory capital, Common Equity, Tier 1 Amount $ 6,335 $ 4,226
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount 3,146 1,966
Excess, Common Equity, Tier 1 Amount $ 3,189 $ 2,260
Common Equity, Tier 1 Ratio    
Total regulatory capital, Common Equity, Tier 1 Ratio 9.06% 9.68%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio 4.50% 4.50%
Excess, Common Equity, Tier 1 Ratio 4.56% 5.18%
Risk-Based Capital, Tier 1 Amount    
Total regulatory capital, Risk-Based Capital, Tier 1 Amount $ 6,838 $ 4,729
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount 4,195 2,621
Excess, Risk-Based Capital, Tier 1 Amount $ 2,643 $ 2,108
Risk-Based Capital, Tier 1 Ratio    
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio 0.0978 0.1083
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio 0.0600 0.0600
Excess, Risk-Based Capital, Tier 1 Ratio 0.0378 0.0483
Risk-Based Capital, Total Amount    
Total regulatory capital, Risk-Based Capital, Total Amount $ 8,154 $ 5,558
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount 5,593 3,494
Excess, Risk-Based Capital, Total Amount $ 2,561 $ 2,064
Risk-Based Capital, Total Ratio    
Total regulatory capital, Risk-Based Capital, Total Ratio 0.1166 0.1273
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio 0.0800 0.0800
Excess, Risk-Based Capital, Total Ratio 0.0366 0.0473
Leverage Capital, Amount    
Total regulatory capital, Leverage Capital, Amount $ 6,838 $ 4,729
Minimum for capital adequacy purposes, Leverage Capital, Amount 2,819 2,237
Excess, Leverage Capital, Amount $ 4,019 $ 2,492
Leverage Capital, Ratio    
Total regulatory capital, Leverage Capital, Ratio 0.0970 0.0846
Minimum for capital adequacy purposes, Leverage Capital, Ratio 0.0400 0.0400
Excess, Leverage Capital, Ratio 0.0570 0.0446