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CONSOLIDATED STATEMENTS 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 | 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		7,989		0		0		7,989
Other comprehensive income, net of tax	0		0		0		2,214		0		2,214
Cash dividends paid	0		0		(4,721)		0		0		(4,721)
Purchase of treasury stock	0		0		0		0		(2,912)		(2,912)
Stock-based compensation	0		1,824		0		0		93		1,917
Employee stock ownership plan	0		765		0		0		1,792		2,557
Balance at end of period at Mar. 31, 2018	47,872		102,646		359,232		(1,895)		(48,346)		459,509
Balance at beginning of period at Dec. 31, 2018	47,872		102,470		380,113		(9,594)		(53,660)		467,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0		0		12,216		0		0		12,216
Other comprehensive income, net of tax	0		0		0		690		0		690
Cash dividends paid	0		0		(5,159)		0		0		(5,159)
Purchase of treasury stock	0		0		0		0		(6,327)		(6,327)
Stock-based compensation	0		1,252		0		0		648		1,900
Employee stock ownership plan	0		745		0		0		1,774		2,519
Balance at end of period at Mar. 31, 2019	$ 47,872		$ 104,467		$ 387,170		$ (8,904)		$ (57,565)		$ 473,040

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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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