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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Purchase of treasury shares (in shares) | 142,405 | 40,000 |
Dividends on common share (in dollars per share) | $ 0.84 | $ 0.84 | $ 0.80
Common Stock [Member] |  |  |
Shares issued in acquisition of Empire Bancorp, Inc. (in shares) | 2,557,028 |  |
Common shares released from Employee Benefit Trust, shares (in shares) | 145,447 | 154,746 | 129,601
Restricted stock unit awards vested, shares (in shares) | 281,636 | 297,559 | 258,567
Exercise of stock options, shares (in shares) |  | 300 | 900
Treasury Stock [Member] |  |  |
Purchase of treasury shares (in shares) | 142,405 | 40,000 | 787,069
Repurchase of shares to satisfy tax obligation, shares (in shares) | 77,611 | 84,290 | 76,698

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