Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Held to maturity, fair value	$ 1,891,982	$ 1,621,039
Loans held for sale, fair value	$ 27,868	$ 16,832
Preferred stock, par value (in usd per share)
Preferred stock, shares authorized (in shares)	30,000,000	30,000,000
Preferred stock, shares issued (in shares)	4,600,000	4,600,000
Common stock, par value (in usd per share)
Common stock, shares authorized (in shares)	332,023,233	332,023,233
Common stock, shares issued (in shares)	254,492,480	253,787,561
Treasury stock, shares (in shares)	30,574	0