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Allowance for Loan Losses - Information Regarding Loans Modified under TDR (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract	Dec. 31, 2012 Contracts	Dec. 31, 2011 Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	2	19
Pre-modification outstanding recorded investment		$ 2,609	$ 16,197
Post-modification outstanding recorded investment		2,609	15,879
Real Estate Loans [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1
Pre-modification outstanding recorded investment			701
Post-modification outstanding recorded investment			357
Real Estate Loans [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1	4
Pre-modification outstanding recorded investment		183	2,667
Post-modification outstanding recorded investment		183	2,667
Real Estate Loans [Member] | Other Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1	14
Pre-modification outstanding recorded investment		2,426	12,829
Post-modification outstanding recorded investment		2,426	12,855
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Pre-modification outstanding recorded investment
Post-modification outstanding recorded investment
Consumer and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Pre-modification outstanding recorded investment
Post-modification outstanding recorded investment

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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