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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Common stock, par value (in usd per share) $ 2 $ 2 $ 2
Dividends declared, per share (in usd per share) $ 1.01 $ 1.00 $ 0.96