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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%