Organization, Basis of Presentation and Recently Adopted Accounting Standards - Additional Information (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) Branch $ / 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).
Cumulative effect on retained earnings, reduction in tax | $	$ 10.5
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
New York Community Bank
Organization and Basis of Presentation [Line Items]
Number of branches | Branch	236
New York Community Bank | Corporate Segment
Organization and Basis of Presentation [Line Items]
Number of branches | Branch	19
New York Community Bank | Corporate and Other
Organization and Basis of Presentation [Line Items]
Number of branches | Branch	217
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