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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Dividends on common stock (in dollars per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21
Common Stock [Member]
Common shares released from Employee Benefit Trust, shares (in shares)	9,384	10,956	116,414	5,015	5,568	138,775
Restricted stock unit awards vested, shares (in shares)	1,640	6,390	272,946	9,284	1,120	287,155
Exercise of stock options, shares (in shares)						300
Treasury Stock [Member]
Purchase of treasury shares (in shares)			142,405	40,000
Repurchase of shares to satisfy tax obligation, shares (in shares)	647	2,558	74,145		382	83,908

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

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