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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, 2016
Dec. 31, 2015
Common Equity, Tier 1 Amount    
Total regulatory capital, Common Equity, Tier 1 Amount $ 3,748,231 $ 3,558,415
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount 1,588,699 1,609,639
Excess, Common Equity, Tier 1 Amount $ 2,159,532 $ 1,948,776
Common Equity, Tier 1 Ratio    
Total regulatory capital, Common Equity, Tier 1 Ratio 10.62% 9.95%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio 4.50% 4.50%
Excess, Common Equity, Tier 1 Ratio 6.12% 5.45%
Leverage Capital, Amount    
Total regulatory capital, Leverage Capital, Amount $ 3,748,231 $ 3,644,872
Minimum for capital adequacy purposes, Leverage Capital, Amount 1,875,062 1,876,006
Excess, Leverage Capital, Amount $ 1,873,169 $ 1,768,866
Leverage Capital, Ratio    
Total regulatory capital, Leverage Capital, Ratio 8.00% 7.77%
Minimum for capital adequacy purposes, Leverage Capital, Ratio 4.00% 4.00%
Excess, Leverage Capital, Ratio 4.00% 3.77%
Risk-Based Capital, Tier 1 Amount    
Total regulatory capital, Risk-Based Capital, Tier 1 Amount $ 3,748,231 $ 3,644,872
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount 2,118,266 2,146,186
Excess, Risk-Based Capital, Tier 1 Amount $ 1,629,965 $ 1,498,686
Risk-Based Capital, Tier 1 Ratio    
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio 10.62% 10.19%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio 6.00% 6.00%
Excess, Risk-Based Capital, Tier 1 Ratio 4.62% 4.19%
Risk-Based Capital, Total Amount    
Total regulatory capital, Risk-Based Capital, Total Amount $ 4,277,759 $ 4,086,913
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount 2,824,355 2,861,581
Excess, Risk-Based Capital, Total Amount $ 1,453,404 $ 1,225,332
Risk-Based Capital, Total Ratio    
Total regulatory capital, Risk-Based Capital, Total Ratio 12.12% 11.43%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio 8.00% 8.00%
Excess, Risk-Based Capital, Total Ratio 4.12% 3.43%
New York Commercial Bank    
Common Equity, Tier 1 Amount    
Total regulatory capital, Common Equity, Tier 1 Amount $ 370,707 $ 384,221
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount 117,973 128,732
Excess, Common Equity, Tier 1 Amount $ 252,734 $ 255,489
Common Equity, Tier 1 Ratio    
Total regulatory capital, Common Equity, Tier 1 Ratio 14.14% 13.43%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio 4.50% 4.50%
Excess, Common Equity, Tier 1 Ratio 9.64% 8.93%
Leverage Capital, Amount    
Total regulatory capital, Leverage Capital, Amount $ 370,707 $ 384,221
Minimum for capital adequacy purposes, Leverage Capital, Amount 140,813 153,507
Excess, Leverage Capital, Amount $ 229,894 $ 230,714
Leverage Capital, Ratio    
Total regulatory capital, Leverage Capital, Ratio 10.53% 10.01%
Minimum for capital adequacy purposes, Leverage Capital, Ratio 4.00% 4.00%
Excess, Leverage Capital, Ratio 6.53% 6.01%
Risk-Based Capital, Tier 1 Amount    
Total regulatory capital, Risk-Based Capital, Tier 1 Amount $ 370,707 $ 384,221
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount 157,297 171,642
Excess, Risk-Based Capital, Tier 1 Amount $ 213,410 $ 212,579
Risk-Based Capital, Tier 1 Ratio    
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio 14.14% 13.43%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio 6.00% 6.00%
Excess, Risk-Based Capital, Tier 1 Ratio 8.14% 7.43%
Risk-Based Capital, Total Amount    
Total regulatory capital, Risk-Based Capital, Total Amount $ 397,259 $ 400,058
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount 209,729 228,857
Excess, Risk-Based Capital, Total Amount $ 187,530 $ 171,201
Risk-Based Capital, Total Ratio    
Total regulatory capital, Risk-Based Capital, Total Ratio 15.15% 13.98%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio 8.00% 8.00%
Excess, Risk-Based Capital, Total Ratio 7.15% 5.98%