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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dividends $ 0.44 $ 0.44  
Retained Earnings      
Dividends $ 0.44 $ 0.44 $ 0.44