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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Retained Earnings        
Common stock, dividends, per share (in dollars per share) $ 0.28 $ 0.27 $ 0.83 $ 0.81