Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Security held-to-maturity, fair value	$ 4,125,125	$ 3,961,534
LHFS, at fair value option	$ 60,260	$ 0
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	5,060	5,060
Preferred Stock, Shares Outstanding	5,060	5,060
Common stock par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	93,651,601	93,651,601
Treasury stock, shares	1,899,502	2,090,409