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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retained Earnings      
Cash dividend per share (in dollars [er share) $ 0.62 $ 0.60 $ 0.54
Treasury Stock      
Issued treasury shares to finance acquisition     14,547,452
Purchase of common stock, shares 459,251   90,000