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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]        
Distribution of shares of treasury stock for employee restricted stock awards (in shares)       255
Cash dividends declared (in dollars per share) $ 0.31 $ 0.26 $ 0.57 $ 0.52
Distribution of shares of treasury stock for directors' compensation (in shares)     9,291 7,923
Distribution of shares of treasury stock for employee stock compensation (in shares)     3,860 2,274
Distribution of shares of treasury stock for deferred directors’ compensation (in shares) 2,707 6,426 2,707 6,426
Purchase of shares of treasury stock (in shares) 5,831 117,880 28,706 122,021
Sale of shares of treasury stock (in shares) 2,333 13,778 6,024 27,963
Forfeitures of shares of restricted stock awards (in shares)       112