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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
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