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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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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

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