Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment securities held to maturity	$ 1,837,620	$ 1,924,597
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	450,000,000	450,000,000
Common stock, shares issued (in shares)	264,498,643	263,804,877
Treasury stock, shares (in shares)	29,792	166,047
Preferred Class A
Preferred stock, shares issued (in shares)	4,600,000	4,600,000
Preferred Class B
Preferred stock, shares issued (in shares)	4,000,000	0