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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

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)



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

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-Publisher FASB



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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.

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