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Actual Capital Amounts and Ratios for Commercial Bank in Comparison With Minimum Amounts and Ratios Required (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Common Equity, Tier 1 Amount    
Total regulatory capital, Common Equity, Tier 1 Amount $ 3,558,415  
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount 1,526,064  
Excess, Common Equity, Tier 1 Amount $ 2,032,351  
Common Equity, Tier 1 Ratio    
Total regulatory capital, Common Equity, Tier 1 Ratio 10.49%  
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio 4.50%  
Excess, Common Equity, Tier 1 Ratio 5.99%  
Leverage Capital, Amount    
Total regulatory capital, Leverage Capital, Amount $ 3,644,872 $ 3,731,430
Minimum for capital adequacy purposes, Leverage Capital, Amount 1,876,006 1,856,755
Excess, Leverage Capital, Amount $ 1,768,866 $ 1,874,675
Leverage Capital, Ratio    
Total regulatory capital, Leverage Capital, Ratio 7.77% 8.04%
Minimum for capital adequacy purposes, Leverage Capital, Ratio 4.00% 4.00%
Excess, Leverage Capital, Ratio 3.77% 4.04%
Risk-Based Capital, Tier 1 Amount    
Total regulatory capital, Risk-Based Capital, Tier 1 Amount $ 3,644,872 $ 3,731,430
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount 2,034,752 1,213,802
Excess, Risk-Based Capital, Tier 1 Amount $ 1,610,120 $ 2,517,628
Risk-Based Capital, Tier 1 Ratio    
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio 10.75% 12.30%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio 6.00% 4.00%
Excess, Risk-Based Capital, Tier 1 Ratio 4.75% 8.30%
Risk-Based Capital, Total Amount    
Total regulatory capital, Risk-Based Capital, Total Amount $ 4,086,913 $ 3,919,248
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount 2,713,003 2,427,605
Excess, Risk-Based Capital, Total Amount $ 1,373,910 $ 1,491,643
Risk-Based Capital, Total Ratio    
Total regulatory capital, Risk-Based Capital, Total Ratio 12.05% 12.92%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio 8.00% 8.00%
Excess, Risk-Based Capital, Total Ratio 4.05% 4.92%
New York Commercial Bank    
Common Equity, Tier 1 Amount    
Total regulatory capital, Common Equity, Tier 1 Amount $ 384,221  
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount 122,152  
Excess, Common Equity, Tier 1 Amount $ 262,069  
Common Equity, Tier 1 Ratio    
Total regulatory capital, Common Equity, Tier 1 Ratio 14.15%  
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio 4.50%  
Excess, Common Equity, Tier 1 Ratio 9.65%  
Leverage Capital, Amount    
Total regulatory capital, Leverage Capital, Amount $ 384,221 $ 364,591
Minimum for capital adequacy purposes, Leverage Capital, Amount 153,507 157,599
Excess, Leverage Capital, Amount $ 230,714 $ 206,992
Leverage Capital, Ratio    
Total regulatory capital, Leverage Capital, Ratio 10.01% 9.25%
Minimum for capital adequacy purposes, Leverage Capital, Ratio 4.00% 4.00%
Excess, Leverage Capital, Ratio 6.01% 5.25%
Risk-Based Capital, Tier 1 Amount    
Total regulatory capital, Risk-Based Capital, Tier 1 Amount $ 384,221 $ 364,591
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount 162,870 120,755
Excess, Risk-Based Capital, Tier 1 Amount $ 221,351 $ 243,836
Risk-Based Capital, Tier 1 Ratio    
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio 14.74% 12.08%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio 6.00% 4.00%
Excess, Risk-Based Capital, Tier 1 Ratio 8.15% 8.08%
Risk-Based Capital, Total Amount    
Total regulatory capital, Risk-Based Capital, Total Amount $ 400,058 $ 376,538
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount 217,160 241,509
Excess, Risk-Based Capital, Total Amount $ 182,898 $ 135,029
Risk-Based Capital, Total Ratio    
Total regulatory capital, Risk-Based Capital, Total Ratio 14.74% 12.47%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio 8.00% 8.00%
Excess, Risk-Based Capital, Total Ratio 6.74% 4.47%