Consolidated Balance Sheets Parenthetical - shares	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Statement of Financial Position [Abstract]
Common stock, shares authorized	300,000,000	300,000,000	300,000,000
Common stock, shares issued	170,183,540	170,183,540	170,183,540
5.875% Non-Cumulative Perpetual Preferred stock, Series A, authorized 115,000 shares	115,000	115,000	115,000
5.875% Non-Cumulative Perpetual Preferred stock, Series A, 100,000 outstanding	100,000	100,000	100,000
Treasury stock, at cost	4,410,939	4,793,566	4,790,517