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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]    
Issuance of common stock for dividend reinvestment plan (in shares) 10,607 10,565
Cash dividends paid on common stock (in dollars per share) $ 0.31 $ 0.30
Common stock purchased (in shares) 869,723 40,852
Net issuance of common stock under employee stock plans (in shares) 47,428 23,617