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Loans Receivable and Allowance for Loan Losses - Bank's Ratings Based on its Internal Risk Rating System (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Bank's ratings based on its internal risk rating system
Total Loans	$ 680,374	$ 671,037
Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	45,125	33,446
Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	62,385	60,996
Commercial Real Estate [Member]
Bank's ratings based on its internal risk rating system
Total Loans	314,907	325,397
Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	97,401	111,290
Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	142,146	135,953
Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	26,801	22,882
Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	48,559	55,272
Acquisition and Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	20,777	22,778
Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	5,297	3,338
Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	15,480	19,440
Residential Mortgage [Member]
Bank's ratings based on its internal risk rating system
Total Loans	231,058	222,236
Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	126,552	124,728
Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	20,833	20,131
Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	83,673	77,377
Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	6,122	6,184
Pass [Member]
Bank's ratings based on its internal risk rating system
Total Loans	621,954	593,361
Pass [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	41,568	28,933
Pass [Member] | Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	62,385	60,996
Pass [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	84,959	92,063
Pass [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	121,406	107,113
Pass [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	24,367	20,091
Pass [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	38,590	42,007
Pass [Member] | Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	5,297	3,292
Pass [Member] | Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	11,801	14,118
Pass [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	121,583	121,353
Pass [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	20,761	20,024
Pass [Member] | Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	83,132	77,187
Pass [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	6,105	6,184
Special Mention [Member]
Bank's ratings based on its internal risk rating system
Total Loans	30,765	20,885
Special Mention [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,742	2,129
Special Mention [Member] | Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Special Mention [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	3,367	3,305
Special Mention [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	17,034	6,904
Special Mention [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,108	2,132
Special Mention [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	6,117	4,982
Special Mention [Member] | Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Special Mention [Member] | Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,082	1,433
Special Mention [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Special Mention [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Special Mention [Member] | Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	315	0
Special Mention [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Non-Impaired Substandard [Member]
Bank's ratings based on its internal risk rating system
Total Loans	13,297	31,456
Non-Impaired Substandard [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,121	383
Non-Impaired Substandard [Member] | Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Non-Impaired Substandard [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	5,915	11,360
Non-Impaired Substandard [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,287	14,819
Non-Impaired Substandard [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,230	337
Non-Impaired Substandard [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	2,212	3,790
Non-Impaired Substandard [Member] | Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	46
Non-Impaired Substandard [Member] | Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,348	712
Non-Impaired Substandard [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Non-Impaired Substandard [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Non-Impaired Substandard [Member] | Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	184	9
Non-Impaired Substandard [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Impaired - Substandard [Member]
Bank's ratings based on its internal risk rating system
Total Loans	14,165	24,696
Impaired - Substandard [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	575	1,878
Impaired - Substandard [Member] | Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Impaired - Substandard [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	3,160	4,107
Impaired - Substandard [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	2,378	7,117
Impaired - Substandard [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	96	322
Impaired - Substandard [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,640	4,493
Impaired - Substandard [Member] | Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Impaired - Substandard [Member] | Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,249	3,177
Impaired - Substandard [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	4,936	3,327
Impaired - Substandard [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	72	94
Impaired - Substandard [Member] | Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	42	181
Impaired - Substandard [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	17	0
Doubtful [Member]
Bank's ratings based on its internal risk rating system
Total Loans	193	639
Doubtful [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	119	123
Doubtful [Member] | Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	455
Doubtful [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	41	0
Doubtful [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member] | Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member] | Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	33	48
Doubtful [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	13
Doubtful [Member] | Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	$ 0	$ 0

X

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration