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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]    
Stock option exercises (shares) 227,851 491,675
Stock Issued During Period, Shares, Acquisitions 0 2,000,000
Treasury Stock, Shares, Acquired 1,095,308 0
Cash dividends declared on preferred stock, per share $ 1.01 $ 1.01
Cash dividends declared on common stock, per share $ 1.57 $ 1.52