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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Common stock, cash dividends, per share, declared $ 0.36 $ 0.33
Retained earnings    
Common stock, cash dividends, per share, declared $ 0.36 $ 0.33