Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held to maturity, fair value		$ 3,059,223	$ 2,294,777
Loans held for sale, fair value	[1]	121,941	0
Unearned income on loans		$ 60,250	$ 52,723
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, liquidation preference per share (in dollars per share)		$ 1,000	$ 1,000
Preferred stock, shares authorized		20,000,000	20,000,000
Preferred stock, shares issued		110,877	110,877
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized		500,000,000	500,000,000
Common stock, shares issued		324,854,375	212,378,494
Treasury stock, shares		1,627,901	1,318,947

[1] Amount represents loans for which we have elected the fair value option. See Note 17.