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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
Common stock, cash dividends, per share, declared $ 0.48 $ 0.44 $ 0.42
Retained earnings      
Common stock, cash dividends, per share, declared $ 0.48 $ 0.44 $ 0.42