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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) [Abstract]        
Purchase of treasury stock (in shares) 14,858 3,382 20,620 8,711
Cash dividends (in dollars per share) $ 0.441 $ 0.427 $ 0.881 $ 0.853