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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 7,799 | $ 9,550 | $ 8,456
Recorded Investment with No Allowance | 6,281 | 6,644 | 6,784
Recorded Investment with Allowance | 632 | 2,196 | 921
Total Recorded Investment | 6,913 | 8,840 | 7,705
Related Allowance | 256 | 750 | 544
Average Recorded Investment | 7,539 | 11,503 | 10,544
Interest Income Recognized | 137 | 182 | 225
Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 2,992 | 3,256 | 2,741
Recorded Investment with No Allowance | 2,749 | 2,416 | 2,206
Recorded Investment with Allowance |  | 665 | 338
Total Recorded Investment | 2,749 | 3,081 | 2,544
Related Allowance |  | 132 | 326
Average Recorded Investment | 2,599 | 3,127 | 2,967
Interest Income Recognized | 40 | 45 | 60
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 2,114 | 2,222 | 2,116
Recorded Investment with No Allowance | 2,006 | 2,129 | 2,021
Recorded Investment with Allowance | 88 | 22 | 23
Total Recorded Investment | 2,094 | 2,151 | 2,044
Related Allowance | 33 | 22 | 23
Average Recorded Investment | 2,045 | 2,687 | 2,526
Interest Income Recognized | 73 | 88 | 107
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 2,596 | 3,961 | 3,492
Recorded Investment with No Allowance | 1,447 | 2,000 | 2,463
Recorded Investment with Allowance | 544 | 1,509 | 560
Total Recorded Investment | 1,991 | 3,509 | 3,023
Related Allowance | 223 | 596 | 195
Average Recorded Investment | 2,808 | 5,563 | 4,933
Interest Income Recognized | 24 | 49 | 58
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 97 | 111 | 107
Recorded Investment with No Allowance | 79 | 99 | 94
Total Recorded Investment | 79 | 99 | 94
Average Recorded Investment | $ 87 | $ 126 | $ 118

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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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&loc=SL6953550-111524 + Details
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