Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Investment securities held to maturity	$ 1,924,597	$ 1,621,039
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued	4,600,000	4,600,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	332,023,233	332,023,233
Common stock, shares issued	263,804,877	253,787,561
Treasury stock, shares	166,047	0