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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY [Abstract]    
Purchase of treasury stock (in shares) 9,202 23,412
Restricted stock (in shares) 6,651  
Cash dividends (in dollars per share) $ 0.465 $ 0.549