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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared (USD per share) $ 0.76 $ 0.72 $ 0.72