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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Dividends on common stock, per share amount $ 0.32 $ 0.30 $ 0.28