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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Common Stock [Member] Adjustments Due to Adoption of ASU 2014-09 [Member]	Capital in Excess of Par Value [Member]	Capital in Excess of Par Value [Member] Adjustments Due to Adoption of ASU 2014-09 [Member]	Retained Earnings [Member]	Retained Earnings [Member] Adjustments Due to Adoption of ASU 2014-09 [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Adjustments Due to Adoption of ASU 2014-09 [Member]	Treasury Stock [Member]	Treasury Stock [Member] Adjustments Due to Adoption of ASU 2014-09 [Member]	Total	Adjustments Due to Adoption of ASU 2014-09 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment (Note 2) | ASC 606 [Member]		$ 0		$ 0		$ (1,189)		$ 0		$ 0		$ (1,189)
Balance at beginning of period at Dec. 31, 2017	$ 47,872		$ 100,057		$ 357,153		$ (4,109)		$ (47,319)		$ 453,654
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0		0		39,683		0		0		39,683
Net earnings | ASC 606 [Member]												638
Other comprehensive income (loss), net of tax	0		0		0		(3,008)		0		(3,008)
Cash dividends paid	0		0		(14,144)		0		0		(14,144)
Purchase of treasury stock	0		0		0		0		(9,115)		(9,115)
Stock-based compensation	0		4,054		0		0		1,560		5,614
Employee Stock Ownership Plan	0		765		0		0		1,792		2,557
Balance at end of period at Sep. 30, 2018	47,872		104,876		381,503		(7,117)		(53,082)		474,052
Balance at beginning of period at Jun. 30, 2018							(7,830)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings											15,749
Net earnings | ASC 606 [Member]												$ (155)
Other comprehensive income (loss), net of tax											713
Balance at end of period at Sep. 30, 2018	$ 47,872		$ 104,876		$ 381,503		$ (7,117)		$ (53,082)		$ 474,052

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Value of shares committed to be released under an Employee Stock Ownership Plan (ESOP).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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