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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, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 5,512 | $ 8,232 | $ 5,545
Recorded Investment with No Allowance | 4,383 | 6,836 | 4,707
Recorded Investment with Allowance | 424 | 548 | 153
Total Recorded Investment | 4,807 | 7,384 | 4,860
Related Allowance | 57 | 184 | 37
Average Recorded Investment | 4,651 | 7,651 | 7,034
Interest Income Recognized | 108 | 100 | 176
Construction and Land Development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 2,066 | 2,900 | 2,388
Recorded Investment with No Allowance | 1,613 | 2,664 | 1,973
Recorded Investment with Allowance | 0 | 0 | 0
Total Recorded Investment | 1,613 | 2,664 | 1,973
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 1,955 | 2,545 | 2,407
Interest Income Recognized | 26 | 31 | 66
Secured by 1-4 Family Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 1,820 | 2,041 | 1,851
Recorded Investment with No Allowance | 1,348 | 2,022 | 1,675
Recorded Investment with Allowance | 424 | 0 | 153
Total Recorded Investment | 1,772 | 2,022 | 1,828
Related Allowance | 57 | 0 | 37
Average Recorded Investment | 1,667 | 2,051 | 2,013
Interest Income Recognized | 31 | 52 | 87
Other real estate loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 1,540 | 3,191 | 1,213
Recorded Investment with No Allowance | 1,355 | 2,066 | 984
Recorded Investment with Allowance | 0 | 548 | 0
Total Recorded Investment | 1,355 | 2,614 | 984
Related Allowance | 0 | 184 | 0
Average Recorded Investment | 958 | 2,965 | 2,529
Interest Income Recognized | 49 | 17 | 22
Commercial and Industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 86 | 100 | 93
Recorded Investment with No Allowance | 67 | 84 | 75
Recorded Investment with Allowance | 0 | 0 | 0
Total Recorded Investment | 67 | 84 | 75
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 71 | 90 | 85
Interest Income Recognized | $ 2 | $ 0 | $ 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=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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