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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		23,934		0		0		23,934
Net earnings | ASC 606 [Member]												793
Other comprehensive income, net of tax	0		0		0		(3,721)		0		(3,721)
Cash dividends paid	0		0		(9,437)		0		0		(9,437)
Purchase of treasury stock	0		0		0		0		(7,324)		(7,324)
Stock-based compensation	0		2,581		0		0		1,315		3,896
Employee Stock Ownership Plan	0		765		0		0		1,792		2,557
Balance at end of period at Jun. 30, 2018	47,872		103,403		370,461		(7,830)		(51,536)		462,370
Balance at beginning of period at Mar. 31, 2018							(1,895)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings											15,945
Net earnings | ASC 606 [Member]												$ 402
Other comprehensive income, net of tax											(5,935)
Balance at end of period at Jun. 30, 2018	$ 47,872		$ 103,403		$ 370,461		$ (7,830)		$ (51,536)		$ 462,370

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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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