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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, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 18,556 | $ 21,880 | $ 26,072
Recorded Investment with No Allowance | 12,322 | 12,838 | 16,343
Recorded Investment with Allowance | 4,521 | 4,752 | 5,351
Total Recorded Investment | 16,843 | 17,590 | 21,694
Related Allowance | 1,709 | 1,081 | 1,379
Average Recorded Investment | 20,295 | 14,754 | 16,009
Interest Income Recognized | 331 | 528 | 805
Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 3,588 | 9,441 | 9,086
Recorded Investment with No Allowance | 2,129 | 5,406 | 4,259
Recorded Investment with Allowance | 1,253 | 1,811 | 2,603
Total Recorded Investment | 3,382 | 7,217 | 6,862
Related Allowance | 626 | 743 | 882
Average Recorded Investment | 6,289 | 4,469 | 5,397
Interest Income Recognized | 34 | 217 | 204
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 4,384 | 4,339 | 4,341
Recorded Investment with No Allowance | 2,686 | 2,533 | 2,515
Recorded Investment with Allowance | 750 | 906 | 916
Total Recorded Investment | 3,436 | 3,439 | 3,431
Related Allowance | 133 | 81 | 190
Average Recorded Investment | 3,200 | 2,673 | 2,864
Interest Income Recognized | 108 | 105 | 146
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 10,453 | 7,855 | 12,385
Recorded Investment with No Allowance | 7,499 | 4,883 | 9,455
Recorded Investment with Allowance | 2,400 | 1,807 | 1,688
Total Recorded Investment | 9,899 | 6,690 | 11,143
Related Allowance | 914 | 201 | 263
Average Recorded Investment | 10,635 | 6,817 | 7,079
Interest Income Recognized | 188 | 197 | 441
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 131 | 245 | 260
Recorded Investment with No Allowance | 8 | 16 | 114
Recorded Investment with Allowance | 118 | 228 | 144
Total Recorded Investment | 126 | 244 | 258
Related Allowance | 36 | 56 | 44
Average Recorded Investment | 171 | 795 | 669
Interest Income Recognized | 1 | 9 | 14
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 0 |  | 0
Recorded Investment with No Allowance | 0 |  | 0
Recorded Investment with Allowance | 0 |  | 0
Total Recorded Investment | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment | 0 |  | 0
Interest Income Recognized | $ 0 |  | $ 0

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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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=35738203&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=35738203&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=35738203&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=35738203&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=35738203&loc=SL6953550-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is 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=35738203&loc=SL6953550-111524 + Details
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