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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Additional Paid-in Capital [Member]
Common shares released from Employee Benefit Trust, shares (in shares)	116,229	107,605
Restricted stock unit awards vested, shares (in shares)	248,877	256,810
Common shares released from Employee Benefit Trust, shares (in shares)	116,229	107,605
Restricted stock unit awards vested, shares (in shares)	248,877	256,810
Treasury Stock [Member] | Shares Purchased to Fund Options Exercised [Member]
Purchase of treasury shares (in shares)	217,863
Treasury Stock [Member] | Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Purchase of treasury shares (in shares)	72,837	78,554
Retained Earnings [Member]
Dividends on common stock (in dollars per share)	$ 0.20	$ 0.18

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

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