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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 per common share (in dollars per share) $ 0.24 $ 0.18 $ 0.20