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Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 3 Months Ended
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Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021
Dividends on common share (in dollars per share) | $ 0.22 | $ 0.22 | $ 0.21 | $ 0.21
Common Stock [Member] |  |  |  |
Common shares released from Employee Benefit Trust, shares (in shares) |  | 17,964 | 6,445 | 5,682
Restricted stock unit awards vested, shares (in shares) | 2,015 | 297,626 | 10,932 | 248,896
Purchase of treasury shares (in shares) | 387,689 |  |  |
Treasury Stock [Member] |  |  |  |
Purchase of treasury shares (in shares) |  | 360,000 |  |
Repurchase of shares to satisfy tax obligation, shares (in shares) | 766 | 97,435 | 3,886 | 70,292

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