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Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 18,556	$ 21,880	$ 26,072
Recorded Investment with No Allowance	12,322	12,838	16,343
Recorded Investment with Allowance	4,521	4,752	5,351
Total Recorded Investment	16,843	17,590	21,694
Related Allowance	1,709	1,081	1,379
Average Recorded Investment	20,295	14,754	16,009
Interest Income Recognized	331	528	805
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,588	9,441	9,086
Recorded Investment with No Allowance	2,129	5,406	4,259
Recorded Investment with Allowance	1,253	1,811	2,603
Total Recorded Investment	3,382	7,217	6,862
Related Allowance	626	743	882
Average Recorded Investment	6,289	4,469	5,397
Interest Income Recognized	34	217	204
Secured by 1-4 Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,384	4,339	4,341
Recorded Investment with No Allowance	2,686	2,533	2,515
Recorded Investment with Allowance	750	906	916
Total Recorded Investment	3,436	3,439	3,431
Related Allowance	133	81	190
Average Recorded Investment	3,200	2,673	2,864
Interest Income Recognized	108	105	146
Other Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	10,453	7,855	12,385
Recorded Investment with No Allowance	7,499	4,883	9,455
Recorded Investment with Allowance	2,400	1,807	1,688
Total Recorded Investment	9,899	6,690	11,143
Related Allowance	914	201	263
Average Recorded Investment	10,635	6,817	7,079
Interest Income Recognized	188	197	441
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	131	245	260
Recorded Investment with No Allowance	8	16	114
Recorded Investment with Allowance	118	228	144
Total Recorded Investment	126	244	258
Related Allowance	36	56	44
Average Recorded Investment	171	795	669
Interest Income Recognized	1	9	14
Consumer and Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0		0
Recorded Investment with No Allowance	0		0
Recorded Investment with Allowance	0		0
Total Recorded Investment	0		0
Related Allowance	0		0
Average Recorded Investment	0		0
Interest Income Recognized	$ 0		$ 0

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=35738203&loc=SL6953423-111524

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X

- 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=35738203&loc=SL6953423-111524

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X

- 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=35738203&loc=d3e5212-111524



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=35738203&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=35738203&loc=d3e5212-111524

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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=35738203&loc=d3e5212-111524

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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=35738203&loc=SL6953550-111524

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- Definition

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=35738203&loc=SL6953550-111524

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