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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Additional Paid-in Capital [Member] |  |
Common shares released from Employee Benefit Trust, shares (in shares) | 107,605 | 129,831
Restricted stock unit awards vested, shares (in shares) | 256,810 | 245,111
Exercise of stock options, shares (in shares) |  | 18,200
Treasury Stock [Member] | Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member] |  |
Purchase of treasury shares (in shares) | 78,554 | 76,656
Treasury Stock [Member] | Shares Purchased to Fund Options Exercised [Member] |  |
Purchase of treasury shares (in shares) |  | 15,300
Retained Earnings [Member] |  |
Dividends on common stock (in dollars per share) | $ 0.18 | $ 0.17

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