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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared (in dollars per share) $ 0.26 $ 0.26 $ 0.52 $ 0.52
Distribution of shares of treasury stock for directors' compensation (in shares)     7,923 8,465
Distribution of Shares of Treasury Stock for Employee Restricted Stock Awards (in shares)       439
Distribution of shares of treasury stock for employee stock compensation (in shares)     2,274 2,373
Distribution of Shares of Treasury Stock for Deferred Directors’ Compensation (in shares) 6,426 2,551 6,426 2,551
Distribution of shares of treasury stock grants for employee restricted stock awards (in shares)     255  
Purchase of shares of treasury stock (in shares) 117,880   122,021 272
Forfeitures of shares of restricted stock awards (in shares)     112  
Sale of shares of treasury stock (in shares) 13,778 2,485 27,963 6,150