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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash dividends declared | $ 2.34 | $ 2.29 | $ 2.20
Total Shareholders’ Equity | $ 681,105 | $ 701,106 | $ 657,983
Cash dividends declared | $ 2.34 | $ 2.29 | $ 2.20
Exercise of stock options | 14,603 | 4,921 | 11,721
Purchase of treasury shares | 760,000 | 573,000 | 261,000
Retained Earnings [Member] |  |  |
Total Shareholders’ Equity | $ 641,826 | $ 589,988 | $ 539,253
Common Stock [Member] |  |  |
Total Shareholders’ Equity | 47,619 | 47,619 | 47,619
Capital Surplus[Member] |  |  |
Total Shareholders’ Equity | 170,942 | 171,304 | 170,309
Treasury Stock, Common [Member] |  |  |
Total Shareholders’ Equity | (193,542) | (139,038) | (105,038)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Total Shareholders’ Equity | $ 14,260 | $ 31,233 | $ 5,840

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