Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Investment securities held to maturity	$ 1,621,039	$ 1,815,976
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	30,000,000	0
Preferred stock, shares issued	4,600,000	0
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	332,023,233	332,023,233
Common stock, shares issued	253,787,561	232,127,098
Treasury stock, shares	0	16,123