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Share Repurchase Program - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jan. 31, 2012 Rule 10b-18	Jul. 31, 2013 Rule 10b-18 Subsequent Event [Member]
Schedule Of Share Repurchase Programs [Line Items]
Common stock shares, remaining authorized	2,041,214		2,041,214		1,966,700
Common stock, additional number of shares authorized to repurchase						2,000,000
Purchase of Treasury Stock, shares	138,200	172,480	442,938	1,239,222
Purchase of Treasury Stock, per share value	$ 16.92	$ 16.58	$ 16.23	$ 19.09
Purchase of Treasury Stock	$ 2,338	$ 2,859	$ 7,189	$ 23,652

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Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased

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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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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