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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance	$ 15,442	$ 22,675
Recorded Investment with No Allowance	7,411	7,198
Recorded Investment with Allowance	3,433	9,782
Total Recorded Investment	10,844	16,980
Related Allowance	1,122	1,838
Average Recorded Investment	16,875	20,990
Interest Income Recognized	126	548
Construction and Land Development [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance	6,245	2,947
Recorded Investment with No Allowance	2,678	622
Recorded Investment with Allowance	917	1,894
Total Recorded Investment	3,595	2,516
Related Allowance	747	567
Average Recorded Investment	5,059	5,691
Interest Income Recognized	20	99
Secured by 1-4 Family Residential [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance	2,864	4,706
Recorded Investment with No Allowance	856	1,690
Recorded Investment with Allowance	1,084	2,086
Total Recorded Investment	1,940	3,776
Related Allowance	195	306
Average Recorded Investment	3,047	4,821
Interest Income Recognized	14	163
Other Real Estate Loans [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance	6,242	14,861
Recorded Investment with No Allowance	3,877	4,886
Recorded Investment with Allowance	1,342	5,642
Total Recorded Investment	5,219	10,528
Related Allowance	161	930
Average Recorded Investment	8,682	10,148
Interest Income Recognized	90	276
Commercial and Industrial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance	91	161
Recorded Investment with No Allowance
Recorded Investment with Allowance	90	160
Total Recorded Investment	90	160
Related Allowance	19	35
Average Recorded Investment	87	330
Interest Income Recognized	2	10
Consumer and Other Loans [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance
Recorded Investment with No Allowance
Recorded Investment with Allowance
Total Recorded Investment
Related Allowance
Average Recorded Investment
Interest Income Recognized

X

- Definition

Impaired financing receivable interest income recognized.

+ References

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Impaired financing receivables average recorded investment.

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- 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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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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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15

-Subparagraph (a)(4)

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

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+ 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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+ References

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-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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