Organization and Basis of Presentation - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Nov. 23, 1993	Mar. 31, 2015	Dec. 31, 2014	Nov. 23, 1993
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Initial public offering of common stock, par value per share	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Initial public offering of common stock, price per share	$ 25.00
Description of nine stock splits		Reflecting nine stock splits between September 30, 1994 and February 17, 2004, the Company's initial offering price adjusts to $0.93 per share.
New York Community Bank
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of branches		242
New York Community Bank | Directly Operated Banks
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of branches		4
New York Community Bank | Seven Divisional Banks
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of branches		238
New York Commercial Bank
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of branches		30
New York Commercial Bank | Atlantic Bank
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of branches		18
Adjusted for Nine Stock Split
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Initial public offering of common stock, price per share		$ 0.93