Litigation (Details)	16 Months Ended
	Feb. 23, 2017 lawsuit	Mar. 31, 2017 USD ($)	Mar. 06, 2017 USD ($)
New York Community Bancorp, Inc. Merger-related Litigation
Business Acquisition [Line Items]
Number of lawsuits challenging the proposed merger | lawsuit	6
Sterling Merger-related Litigation
Business Acquisition [Line Items]
Liability or reserve recognized		$ 0
Sterling Merger-related Litigation | Sterling Merger Agreement | Sterling
Business Acquisition [Line Items]
Termination fee			$ 75,700,000