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Share Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Class of Stock Disclosures [Abstract]
Purchase of Treasury Stock, shares	158,570	297,463	428,590	1,227,148
Purchase of Treasury Stock, per share value	$ 17.74	$ 14.74	$ 19.03	$ 15.20
Purchase of Treasury Stock	$ 2,813	$ 4,385	$ 8,156	$ 18,657
Common stock shares, available for repurchase	571,410		571,410

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 30



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Number of shares that have been repurchased during the period and are being held in treasury.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 29, 30



-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef



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-Name Regulation S-X (SX)



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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655



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-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.3-04)



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