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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Additional Paid-in Capital [Member]
Common shares released from Employee Benefit Trust, shares (in shares)	111,470	134,005
Restricted stock unit awards vested, shares (in shares)	258,165	245,111
Exercise of stock options, shares (in shares)	4,400	27,945
Treasury Stock [Member] | Shares Purchased to Fund Options Exercised [Member]
Purchase of treasury shares (in shares)	10,000	378,695
Treasury Stock [Member] | Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Purchase of treasury shares (in shares)	80,303	77,212
Retained Earnings [Member]
Dividends on common stock (in dollars per share)	$ 0.36	$ 0.34

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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