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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 23,647 | $ 15,442 | $ 26,072
Recorded Investment with No Allowance | 14,146 | 7,411 | 16,343
Recorded Investment with Allowance | 5,736 | 3,433 | 5,351
Total Recorded Investment | 19,882 | 10,844 | 21,694
Related Allowance | 1,873 | 1,122 | 1,379
Average Recorded Investment | 21,038 | 16,875 | 16,009
Interest Income Recognized | 209 | 126 | 805
Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 8,746 | 6,245 | 9,086
Recorded Investment with No Allowance | 4,022 | 2,678 | 4,259
Recorded Investment with Allowance | 2,405 | 917 | 2,603
Total Recorded Investment | 6,427 | 3,595 | 6,862
Related Allowance | 779 | 747 | 882
Average Recorded Investment | 6,607 | 5,059 | 5,397
Interest Income Recognized | 21 | 20 | 204
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 4,230 | 2,864 | 4,341
Recorded Investment with No Allowance | 2,766 | 856 | 2,515
Recorded Investment with Allowance | 531 | 1,084 | 916
Total Recorded Investment | 3,297 | 1,940 | 3,431
Related Allowance | 126 | 195 | 190
Average Recorded Investment | 3,248 | 3,047 | 2,864
Interest Income Recognized | 62 | 14 | 146
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 10,501 | 6,242 | 12,385
Recorded Investment with No Allowance | 7,347 | 3,877 | 9,455
Recorded Investment with Allowance | 2,647 | 1,342 | 1,688
Total Recorded Investment | 9,994 | 5,219 | 11,143
Related Allowance | 911 | 161 | 263
Average Recorded Investment | 10,998 | 8,682 | 7,079
Interest Income Recognized | 125 | 90 | 441
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 170 | 91 | 260
Recorded Investment with No Allowance | 11 |  | 114
Recorded Investment with Allowance | 153 | 90 | 144
Total Recorded Investment | 164 | 90 | 258
Related Allowance | 57 | 19 | 44
Average Recorded Investment | 185 | 87 | 669
Interest Income Recognized | 1 | 2 | 14
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 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=28368275&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=28368275&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=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 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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- 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=28368275&loc=SL6953550-111524 + Details
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