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Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Cash dividends on common stock, per share $ 0.12 $ 0.10 $ 0.34 $ 0.30