Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fair Value	$ 3,218,379	$ 2,294,777
Loans held for sale	56,458	0
Unearned income on loans	$ 50,680	$ 52,723
Preferred stock, par value (USD per Share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference per share (USD per Share)	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	110,877	110,877
Common stock, par value (USD per Share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	325,095,055	212,378,494
Treasury stock, shares (in shares)	1,629,915	1,318,947