Organization and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016 Location $ / shares	Dec. 31, 2015 $ / shares	Nov. 23, 1993 $ / shares
Organization and Basis Of Presentation [Line Items]
Common stock, par | $ / shares	$ 0.01	$ 0.01	$ 0.01
Description of nine stock splits	($0.93 per share on a split-adjusted basis, reflecting the impact of nine stock splits between 1994 and 2004).
New York Community Bank
Organization and Basis Of Presentation [Line Items]
Number of branches	225
New York Community Bank | Directly Operated Banks
Organization and Basis Of Presentation [Line Items]
Number of branches	2
New York Community Bank | Seven Divisional Banks
Organization and Basis Of Presentation [Line Items]
Number of branches	223
New York Commercial Bank
Organization and Basis Of Presentation [Line Items]
Number of branches	30
New York Commercial Bank | Atlantic Bank
Organization and Basis Of Presentation [Line Items]
Number of branches	18
IPO
Organization and Basis Of Presentation [Line Items]
Shares issued, price per share | $ / shares			$ 25.00
Shares issued, price per share, split adjusted basis | $ / shares	$ 0.93