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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) (Fair Value, Measurements, Nonrecurring [Member], Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended				12 Months Ended
	Jun. 30, 2013 Impaired Loans Assets [Member]	Dec. 31, 2012 Impaired Loans Assets [Member]	Jun. 30, 2013 Other Real Estate Owned [Member]	Dec. 31, 2012 Other Real Estate Owned [Member]	Dec. 31, 2012 Minimum [Member] Impaired Loans Assets [Member]	Dec. 31, 2012 Minimum [Member] Other Real Estate Owned [Member]	Dec. 31, 2012 Maximum [Member] Impaired Loans Assets [Member]	Dec. 31, 2012 Maximum [Member] Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value assets	$ 2,311	$ 7,944	$ 4,084	$ 5,590
Fair Value Measurements, Valuation Techniques	Property appraisals	Property appraisals	Property appraisals	Property appraisals
Selling cost	10.00%	10.00%	7.00%	7.00%
Fair Value Inputs, Discount for lack of marketability					0.00%	0.00%	30.00%	25.00%

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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X

- Definition

Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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