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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 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
Net earnings | ASC 606 [Member]												$ 391
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 Mar. 31, 2018	$ 47,872		$ 102,646		$ 359,232		$ (1,895)		$ (48,346)		$ 459,509

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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