Organization, Basis of Presentation and Recently Adopted Accounting Standards - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) Location $ / shares	Dec. 31, 2019 $ / shares	Nov. 23, 1993 $ / shares
Organization and Basis Of Presentation [Line Items]
Common stock, par | $ / shares	$ 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).
Accounting Standards Update 2016-13 [Member]
Organization and Basis Of Presentation [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax | $	$ 10.5
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
New York Community Bank
Organization and Basis Of Presentation [Line Items]
Number of branches | Location	237
New York Community Bank | Corporate Segment [Member]
Organization and Basis Of Presentation [Line Items]
Number of branches | Location	19
New York Community Bank | Corporate and Other [Member]
Organization and Basis Of Presentation [Line Items]
Number of branches | Location	218