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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
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%