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Fair Value - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Securities	Jun. 30, 2012 Securities	Jun. 30, 2013 Securities	Jun. 30, 2012 Securities	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securities transferred from level 2 to level 1	0	0	0	0
Impaired loans, recorded balance	$ 25,314		$ 25,314		$ 25,520
Impaired loans allowance	2,701		2,701		1,852
Collateral Dependent Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, recorded balance	14,306		14,306		12,535
Impaired loans allowance	2,701		2,701		1,738
Impaired loans, additional provisions	$ 2,328	$ 345	$ 2,529	$ 263

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- Definition

Fair value assets level two to level one transfers number.

+ References

No definition available.

+ Details

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X

- Definition

Impaired financing receivable additional provisions.

+ References

No definition available.

+ Details

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X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

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