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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | $ 21,880 | $ 22,675
Recorded Investment with No Allowance | 12,838 | 7,198
Recorded Investment with Allowance | 4,752 | 9,782
Total Recorded Investment | 17,590 | 16,980
Related Allowance | 1,081 | 1,838
Average Recorded Investment | 14,754 | 20,990
Interest Income Recognized | 528 | 548
Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 9,441 | 2,947
Recorded Investment with No Allowance | 5,406 | 622
Recorded Investment with Allowance | 1,811 | 1,894
Total Recorded Investment | 7,217 | 2,516
Related Allowance | 743 | 567
Average Recorded Investment | 4,469 | 5,691
Interest Income Recognized | 217 | 99
Secured by 1-4 Family Residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 4,339 | 4,706
Recorded Investment with No Allowance | 2,533 | 1,690
Recorded Investment with Allowance | 906 | 2,086
Total Recorded Investment | 3,439 | 3,776
Related Allowance | 81 | 306
Average Recorded Investment | 2,673 | 4,821
Interest Income Recognized | 105 | 163
Other Real Estate Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 7,855 | 14,861
Recorded Investment with No Allowance | 4,883 | 4,886
Recorded Investment with Allowance | 1,807 | 5,642
Total Recorded Investment | 6,690 | 10,528
Related Allowance | 201 | 930
Average Recorded Investment | 6,817 | 10,148
Interest Income Recognized | 197 | 276
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 245 | 161
Recorded Investment with No Allowance | 16 |
Recorded Investment with Allowance | 228 | 160
Total Recorded Investment | 244 | 160
Related Allowance | 56 | 35
Average Recorded Investment | 795 | 330
Interest Income Recognized | 9 | 10
Consumer and Other Loans [Member] |  |
Financing Receivable, Impaired [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 |  |

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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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 + Details
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- 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 + Details
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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 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no 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 + Details
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