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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cash dividends per share (in dollars per share) $ 0.31 $ 0.31 $ 0.93 $ 0.93
Shares of restricted stock awards surrendered (in shares)     1,904 1,245