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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 26,072 | $ 22,675 | $ 32,317
Recorded Investment with No Allowance | 16,343 | 7,198 | 15,161
Recorded Investment with Allowance | 5,351 | 9,782 | 10,758
Total Recorded Investment | 21,694 | 16,980 | 25,920
Related Allowance | 1,379 | 1,838 | 2,438
Average Recorded Investment | 16,009 | 20,990 | 38,174
Interest Income Recognized | 805 | 548 | 1,091
Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 9,086 | 2,947 | 8,106
Recorded Investment with No Allowance | 4,259 | 622 | 3,531
Recorded Investment with Allowance | 2,603 | 1,894 | 4,109
Total Recorded Investment | 6,862 | 2,516 | 7,640
Related Allowance | 882 | 567 | 930
Average Recorded Investment | 5,397 | 5,691 | 7,077
Interest Income Recognized | 204 | 99 | 367
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 4,341 | 4,706 | 8,566
Recorded Investment with No Allowance | 2,515 | 1,690 | 3,495
Recorded Investment with Allowance | 916 | 2,086 | 3,365
Total Recorded Investment | 3,431 | 3,776 | 6,860
Related Allowance | 190 | 306 | 848
Average Recorded Investment | 2,864 | 4,821 | 6,519
Interest Income Recognized | 146 | 163 | 301
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 12,385 | 14,861 | 15,165
Recorded Investment with No Allowance | 9,455 | 4,886 | 8,135
Recorded Investment with Allowance | 1,688 | 5,642 | 2,805
Total Recorded Investment | 11,143 | 10,528 | 10,940
Related Allowance | 263 | 930 | 351
Average Recorded Investment | 7,079 | 10,148 | 23,918
Interest Income Recognized | 441 | 276 | 396
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 260 | 161 | 480
Recorded Investment with No Allowance | 114 |  |
Recorded Investment with Allowance | 144 | 160 | 480
Total Recorded Investment | 258 | 160 | 480
Related Allowance | 44 | 35 | 309
Average Recorded Investment | 669 | 330 | 660
Interest Income Recognized | 14 | 10 | 27
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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