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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Common stock, cash dividends, per share, declared $ 0.26 $ 0.24
Retained earnings    
Common stock, cash dividends, per share, declared $ 0.26 $ 0.24