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Actual Capital Amounts and Ratios for Community Bank in Comparison to Minimum Amounts and Ratios Required (Detail) - Company [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Common Equity, Tier 1 Amount |  |
Total regulatory capital, Common Equity, Tier 1 Amount | $ 3,818,311 | $ 3,806,857
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount | 1,733,826 | 1,624,366
Excess, Common Equity, Tier 1 Amount | $ 2,084,485 | $ 2,182,491
Common Equity, Tier 1 Ratio |  |
Total regulatory capital, Common Equity, Tier 1 Ratio | 9.91% | 10.55%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio | 4.50% | 4.50%
Excess, Common Equity, Tier 1 Ratio | 5.41% | 6.05%
Leverage Capital, Amount |  |
Total regulatory capital, Leverage Capital, Amount | $ 4,321,151 | $ 4,309,697
Minimum for capital adequacy purposes, Leverage Capital, Amount | 1,996,966 | 1,972,440
Excess, Leverage Capital, Amount | $ 2,324,185 | $ 2,337,257
Leverage Capital, Ratio |  |
Total regulatory capital, Leverage Capital, Ratio | 8.66% | 8.74%
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00% | 4.00%
Excess, Leverage Capital, Ratio | 4.66% | 4.74%
Risk-Based Capital, Tier 1 Amount |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Amount | $ 4,321,151 | $ 4,309,697
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount | 2,311,768 | 2,165,822
Excess, Risk-Based Capital, Tier 1 Amount | $ 2,009,383 | $ 2,143,875
Risk-Based Capital, Tier 1 Ratio |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio | 11.22% | 11.94%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio | 6.00% | 6.00%
Excess, Risk-Based Capital, Tier 1 Ratio | 5.22% | 5.94%
Risk-Based Capital, Total Amount |  |
Total regulatory capital, Risk-Based Capital, Total Amount | $ 5,111,990 | $ 5,112,079
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount | 3,082,358 | 2,887,763
Excess, Risk-Based Capital, Total Amount | $ 2,029,632 | $ 2,224,316
Risk-Based Capital, Total Ratio |  |
Total regulatory capital, Risk-Based Capital, Total Ratio | 13.27% | 14.16%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio | 8.00% | 8.00%
Excess, Risk-Based Capital, Total Ratio | 5.27% | 6.16%

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