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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared, per share (USD per share) $ 1.03 $ 0.87 $ 0.83