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Actual Capital Amounts and Ratios for Community Bank in Comparison to 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 Community Bank    
Common Equity, Tier 1 Amount    
Total regulatory capital, Common Equity, Tier 1 Amount $ 3,478,429  
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount 1,417,588  
Excess, Common Equity, Tier 1 Amount $ 2,060,841  
Common Equity, Tier 1 Ratio    
Total regulatory capital, Common Equity, Tier 1 Ratio 11.04%  
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio 4.50%  
Excess, Common Equity, Tier 1 Ratio 6.54%  
Leverage Capital, Amount    
Total regulatory capital, Leverage Capital, Amount $ 3,478,429 $ 3,285,870
Minimum for capital adequacy purposes, Leverage Capital, Amount 1,729,021 1,701,174
Excess, Leverage Capital, Amount $ 1,749,408 $ 1,584,696
Leverage Capital, Ratio    
Total regulatory capital, Leverage Capital, Ratio 8.05% 7.73%
Minimum for capital adequacy purposes, Leverage Capital, Ratio 4.00% 4.00%
Excess, Leverage Capital, Ratio 4.05% 3.73%
Risk-Based Capital, Tier 1 Amount    
Total regulatory capital, Risk-Based Capital, Tier 1 Amount $ 3,478,429 $ 3,285,870
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount 1,890,117 1,093,835
Excess, Risk-Based Capital, Tier 1 Amount $ 1,588,312 $ 2,192,035
Risk-Based Capital, Tier 1 Ratio    
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio 11.04% 12.02%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio 6.00% 4.00%
Excess, Risk-Based Capital, Tier 1 Ratio 5.04% 8.02%
Risk-Based Capital, Total Amount    
Total regulatory capital, Risk-Based Capital, Total Amount $ 3,645,262 $ 3,461,741
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount 2,520,156 2,187,669
Excess, Risk-Based Capital, Total Amount $ 1,125,106 $ 1,274,072
Risk-Based Capital, Total Ratio    
Total regulatory capital, Risk-Based Capital, Total Ratio 11.57% 12.66%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio 8.00% 8.00%
Excess, Risk-Based Capital, Total Ratio 3.57% 4.66%