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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 Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Common Equity, Tier 1 Amount |  |
Total regulatory capital, Common Equity, Tier 1 Amount | $ 3,962,399 | $ 3,818,311
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount | 1,834,858 | 1,733,826
Excess, Common Equity, Tier 1 Amount | $ 2,127,541 | $ 2,084,485
Common Equity, Tier 1 Ratio |  |
Total regulatory capital, Common Equity, Tier 1 Ratio | 9.72% | 9.91%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio | 4.50% | 4.50%
Excess, Common Equity, Tier 1 Ratio | 5.22% | 5.41%
Risk-Based Capital, Tier 1 Amount |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Amount | $ 4,465,239 | $ 4,321,151
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount | 2,446,478 | 2,311,768
Excess, Risk-Based Capital, Tier 1 Amount | $ 2,018,761 | $ 2,009,383
Risk-Based Capital, Tier 1 Ratio |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio | 10.95 | 11.22
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio | 6.00 | 6.00
Excess, Risk-Based Capital, Tier 1 Ratio | 4.95 | 5.22
Risk-Based Capital, Total Amount |  |
Total regulatory capital, Risk-Based Capital, Total Amount | $ 5,289,611 | $ 5,111,990
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount | 3,261,970 | 3,082,358
Excess, Risk-Based Capital, Total Amount | $ 2,027,641 | $ 2,029,632
Risk-Based Capital, Total Ratio |  |
Total regulatory capital, Risk-Based Capital, Total Ratio | 12.97 | 13.27
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio | 8.00 | 8.00
Excess, Risk-Based Capital, Total Ratio | 4.97 | 5.27
Leverage Capital, Amount |  |
Total regulatory capital, Leverage Capital, Amount | $ 4,465,239 | $ 4,321,151
Minimum for capital adequacy purposes, Leverage Capital, Amount | 2,095,846 | 1,996,966
Excess, Leverage Capital, Amount | $ 2,369,393 | $ 2,324,185
Leverage Capital, Ratio |  |
Total regulatory capital, Leverage Capital, Ratio | 8.52 | 8.66
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00 | 4.00
Excess, Leverage Capital, Ratio | 4.52 | 4.66

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