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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, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 9,550	$ 18,556	$ 15,376
Recorded Investment with No Allowance	6,644	12,322	9,039
Recorded Investment with Allowance	2,196	4,521	4,883
Total Recorded Investment	8,840	16,843	13,922
Related Allowance	750	1,709	1,907
Average Recorded Investment	11,503	20,295	19,239
Interest Income Recognized	182	331	385
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,256	3,588	3,299
Recorded Investment with No Allowance	2,416	2,129	2,800
Recorded Investment with Allowance	665	1,253	405
Total Recorded Investment	3,081	3,382	3,205
Related Allowance	132	626	245
Average Recorded Investment	3,127	6,289	5,532
Interest Income Recognized	45	34	40
Secured by 1-4 Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,222	4,384	4,327
Recorded Investment with No Allowance	2,129	2,686	2,526
Recorded Investment with Allowance	22	750	888
Total Recorded Investment	2,151	3,436	3,414
Related Allowance	22	133	173
Average Recorded Investment	2,687	3,200	3,433
Interest Income Recognized	88	108	138
Other Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,961	10,453	7,623
Recorded Investment with No Allowance	2,000	7,499	3,708
Recorded Investment with Allowance	1,509	2,400	3,475
Total Recorded Investment	3,509	9,899	7,183
Related Allowance	596	914	1,456
Average Recorded Investment	5,563	10,635	10,115
Interest Income Recognized	49	188	206
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	111	131	127
Recorded Investment with No Allowance	99	8	5
Recorded Investment with Allowance		118	115
Total Recorded Investment	99	126	120
Related Allowance		36	33
Average Recorded Investment	$ 126	171	159
Interest Income Recognized		$ 1	$ 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=49124121&loc=SL6953423-111524

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The balance of financing receivables that were individually evaluated for impairment.

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-Publisher FASB



-Name Accounting Standards Codification



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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



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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.

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-Publisher FASB



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