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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash dividends declared $ 2.50 $ 2.34 $ 2.29
Total Shareholders’ Equity $ 577,852 $ 681,105 $ 701,106
Cash dividends declared $ 2.50 $ 2.34 $ 2.29
Exercise of stock options 15,141 14,603 4,921
Purchase of treasury shares 325,000 760,000 573,000
Retained Earnings [Member]      
Total Shareholders’ Equity $ 706,696 $ 641,826 $ 589,988
Common Stock [Member]      
Total Shareholders’ Equity 47,619 47,619 47,619
Capital Surplus[Member]      
Total Shareholders’ Equity 170,980 170,942 171,304
Treasury Stock, Common [Member]      
Total Shareholders’ Equity (215,955) (193,542) (139,038)
Accumulated Other Comprehensive Income (Loss) [Member]      
Total Shareholders’ Equity $ (131,488) $ 14,260 $ 31,233