Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Stock option exercises (shares)	171,474	384,775
Stock Issued During Period, Shares, Acquisitions	0	2,000,000
Treasury Stock, Shares, Acquired	140,571	0
Cash dividends declared on preferred stock, per share	$ 0.67	$ 0.67
Cash dividends declared on common stock, per share	$ 1.04	$ 1.01