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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 11,486 | $ 23,647 | $ 15,376
Recorded Investment with No Allowance | 7,308 | 14,146 | 9,039
Recorded Investment with Allowance | 3,462 | 5,736 | 4,883
Total Recorded Investment | 10,770 | 19,882 | 13,922
Related Allowance | 1,563 | 1,873 | 1,907
Average Recorded Investment | 12,994 | 21,038 | 19,239
Interest Income Recognized | 124 | 209 | 385
Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 3,464 | 8,746 | 3,299
Recorded Investment with No Allowance | 2,684 | 4,022 | 2,800
Recorded Investment with Allowance | 635 | 2,405 | 405
Total Recorded Investment | 3,319 | 6,427 | 3,205
Related Allowance | 437 | 779 | 245
Average Recorded Investment | 3,165 | 6,607 | 5,532
Interest Income Recognized | 31 | 21 | 40
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 2,476 | 4,230 | 4,327
Recorded Investment with No Allowance | 2,155 | 2,766 | 2,526
Recorded Investment with Allowance | 232 | 531 | 888
Total Recorded Investment | 2,387 | 3,297 | 3,414
Related Allowance | 79 | 126 | 173
Average Recorded Investment | 2,864 | 3,248 | 3,433
Interest Income Recognized | 57 | 62 | 138
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 5,416 | 10,501 | 7,623
Recorded Investment with No Allowance | 2,453 | 7,347 | 3,708
Recorded Investment with Allowance | 2,491 | 2,647 | 3,475
Total Recorded Investment | 4,944 | 9,994 | 7,183
Related Allowance | 1,025 | 911 | 1,456
Average Recorded Investment | 6,828 | 10,998 | 10,115
Interest Income Recognized | 34 | 125 | 206
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 130 | 170 | 127
Recorded Investment with No Allowance | 16 | 11 | 5
Recorded Investment with Allowance | 104 | 153 | 115
Total Recorded Investment | 120 | 164 | 120
Related Allowance | 22 | 57 | 33
Average Recorded Investment | 137 | 185 | 159
Interest Income Recognized | $ 2 | $ 1 | $ 1

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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=49124121&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=49124121&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=49124121&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=49124121&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=49124121&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=49124121&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=49124121&loc=SL6953550-111524 + Details
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