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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, 2018 | Dec. 31, 2017
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Common Equity, Tier 1 Amount |  |
Total regulatory capital, Common Equity, Tier 1 Amount | $ 3,806,857 | $ 3,869,129
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount | 1,624,366 | 1,532,448
Excess, Common Equity, Tier 1 Amount | $ 2,182,491 | $ 2,336,681
Common Equity, Tier 1 Ratio |  |
Total regulatory capital, Common Equity, Tier 1 Ratio | 10.55% | 11.36%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio | 4.50% | 4.50%
Excess, Common Equity, Tier 1 Ratio | 6.05% | 6.86%
Leverage Capital, Amount |  |
Total regulatory capital, Leverage Capital, Amount | $ 4,309,697 | $ 4,371,969
Minimum for capital adequacy purposes, Leverage Capital, Amount | 1,972,440 | 1,826,141
Excess, Leverage Capital, Amount | $ 2,337,257 | $ 2,545,828
Leverage Capital, Ratio |  |
Total regulatory capital, Leverage Capital, Ratio | 8.74% | 9.58%
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00% | 4.00%
Excess, Leverage Capital, Ratio | 4.74% | 5.58%
Risk-Based Capital, Tier 1 Amount |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Amount | $ 4,309,697 | $ 4,371,969
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount | 2,165,822 | 2,043,265
Excess, Risk-Based Capital, Tier 1 Amount | $ 2,143,875 | $ 2,328,704
Risk-Based Capital, Tier 1 Ratio |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio | 11.94% | 12.84%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio | 6.00% | 6.00%
Excess, Risk-Based Capital, Tier 1 Ratio | 5.94% | 6.84%
Risk-Based Capital, Total Amount |  |
Total regulatory capital, Risk-Based Capital, Total Amount | $ 5,112,079 | $ 4,877,208
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount | 2,887,763 | 2,724,353
Excess, Risk-Based Capital, Total Amount | $ 2,224,316 | $ 2,152,855
Risk-Based Capital, Total Ratio |  |
Total regulatory capital, Risk-Based Capital, Total Ratio | 14.16% | 14.32%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio | 8.00% | 8.00%
Excess, Risk-Based Capital, Total Ratio | 6.16% | 6.32%

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