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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

X

- 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

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- Definition

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+ References

No definition available.

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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

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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

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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

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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

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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

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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=66008989&loc=SL6953550-111524

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