Consolidated Balance Sheet - Unaudited (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Loans held for sale at fair value	$ 2,377,445	$ 1,757,807
Preferred stock, par value (usd per share)	$ 1.0	$ 1.00
Preferred stock, liquidation preference (usd per share)	$ 25.00	$ 25.00
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Preferred stock, shares issued (shares)	9,000,000	2,300,000
Preferred stock, shares outstanding (shares)	9,000,000	2,300,000
Common stock, par value (usd per share)	$ 1.00	$ 1.00
Common stock, shares authorized (shares)	200,000,000	200,000,000
Common stock, shares issued (shares)	28,074,477	27,432,061
Common stock, shares outstanding (shares)	27,544,217	26,901,801
Treasury stock, shares (shares)	530,260	530,260