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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock [Member]
Common shares released from Employee Benefit Trust, shares (in shares)	129,601	118,371	142,065
Restricted stock unit awards vested, shares (in shares)	258,567	284,595	245,311
Exercise of stock options, shares (in shares)	900	4,400	103,530
Treasury Stock [Member]
Purchase of treasury shares (in shares)	787,069	241,625	403,695
Repurchase of shares to satisfy tax obligation, shares (in shares)	76,698	90,779	85,982
Retained Earnings [Member]
Dividends on common stock (in dollars per share)	$ 0.80	$ 0.72	$ 0.68
Purchase of treasury shares (in shares)	787,069	241,625

X

- Definition

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

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