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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
New common shares issued for exercise of stock options, shares | 21,356 | 38,235 | 40,917
Cash dividend declared per common share | $ 0.100 | $ 0.100 | $ 0.095
COMMON STOCK |  |  |
New common shares issued for exercise of stock options, shares | 21,356 | 38,235 | 40,917
TREASURY STOCK |  |  |
Treasury stock, purchased at cost, shares |  | 35,962 | 602,349
CAPITAL SURPLUS |  |  |
New common shares issued for exercise of stock options, shares | 21,356 | 38,235 | 40,917
RETAINED EARNINGS |  |  |
Cash dividend declared per common share | $ 0.100 | $ 0.100 | $ 0.095

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