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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	Mar. 31, 2014	Dec. 31, 2013
Bank's ratings based on its internal risk rating system
Total Loans	$ 673,282	$ 671,037
Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	36,146	33,446
Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	60,927	60,996
Commercial Real Estate [Member]
Bank's ratings based on its internal risk rating system
Total Loans	326,027	325,397
Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	108,238	111,290
Commercial Real Estate [Member] | Non-owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	139,764	135,953
Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	25,227	22,882
Commercial Real Estate [Member] | Non-owner Occupied Residential [Member]
Bank's ratings based on its internal risk rating system
Total Loans	52,798	55,272
Acquisition and Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	20,788	22,778
Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Bank's ratings based on its internal risk rating system
Total Loans	3,702	3,338
Acquisition and Development [Member] | Commercial and Land Development [Member]
Bank's ratings based on its internal risk rating system
Total Loans	17,086	19,440
Residential Mortgage [Member]
Bank's ratings based on its internal risk rating system
Total Loans	223,732	222,236
Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	125,280	124,728
Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	19,630	20,131
Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Bank's ratings based on its internal risk rating system
Total Loans	78,822	77,377
Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	5,662	6,184
Pass [Member]
Bank's ratings based on its internal risk rating system
Total Loans	601,697	593,361
Pass [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	32,318	28,933
Pass [Member] | Municipal [Member]
Bank's ratings based on its internal risk rating system
Total Loans	60,927	60,996
Pass [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	88,920	92,063
Pass [Member] | Commercial Real Estate [Member] | Non-owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	111,469	107,113
Pass [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	22,502	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	42,611	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	3,358	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	13,964	14,118
Pass [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	121,707	121,353
Pass [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	19,521	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	78,738	77,187
Pass [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	5,662	6,184
Special Mention [Member]
Bank's ratings based on its internal risk rating system
Total Loans	25,341	20,885
Special Mention [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,609	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	4,285	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	10,304	6,904
Special Mention [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	1,865	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	5,572	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	344	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	1,347	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	15	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	25,703	31,456
Non-Impaired Substandard [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	43	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	11,097	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	11,011	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	440	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	2,508	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	376	712
Non-Impaired Substandard [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	220	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	8	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	19,966	24,696
Impaired - Substandard [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	2,054	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	3,502	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	6,980	7,117
Impaired - Substandard [Member] | Commercial Real Estate [Member] | Multi - Family [Member]
Bank's ratings based on its internal risk rating system
Total Loans	420	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	2,107	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	1,399	3,177
Impaired - Substandard [Member] | Residential Mortgage [Member] | First Lien [Member]
Bank's ratings based on its internal risk rating system
Total Loans	3,334	3,327
Impaired - Substandard [Member] | Residential Mortgage [Member] | Home Equity - Term [Member]
Bank's ratings based on its internal risk rating system
Total Loans	109	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	61	181
Impaired - Substandard [Member] | Installment and Other Loans [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	0
Doubtful [Member]
Bank's ratings based on its internal risk rating system
Total Loans	575	639
Doubtful [Member] | Commercial and Industrial [Member]
Bank's ratings based on its internal risk rating system
Total Loans	122	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	434	455
Doubtful [Member] | Commercial Real Estate [Member] | Non-owner Occupied [Member]
Bank's ratings based on its internal risk rating system
Total Loans	0	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	19	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=28368275&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

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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