Detailed Amount of Gross Loans Segregated by Loan Grade and Class (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 390,395	$ 392,668
Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	321,796	307,716
Real Estate Loans | Land Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	31,062	27,224
Real Estate Loans | Farmland
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	30,097	29,634
Real Estate Loans | 1-4 Family Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	102,413	105,489
Real Estate Loans | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	158,224	145,369
Business Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	42,111	57,121
Business Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	40,971	55,813
Business Loans | Farm Production and Other Farm Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,140	1,308
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	26,488	27,831
Consumer Loans | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	988	1,087
Consumer Loans | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	25,500	26,744
Satisfactory 1, 2, 3, 4
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	342,468	343,960
Satisfactory 1, 2, 3, 4 | Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	277,426	262,772
Satisfactory 1, 2, 3, 4 | Real Estate Loans | Land Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	29,024	25,165
Satisfactory 1, 2, 3, 4 | Real Estate Loans | Farmland
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	25,603	25,160
Satisfactory 1, 2, 3, 4 | Real Estate Loans | 1-4 Family Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	84,462	87,108
Satisfactory 1, 2, 3, 4 | Real Estate Loans | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	138,337	125,339
Satisfactory 1, 2, 3, 4 | Business Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	39,312	54,169
Satisfactory 1, 2, 3, 4 | Business Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	38,179	52,871
Satisfactory 1, 2, 3, 4 | Business Loans | Farm Production and Other Farm Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,133	1,298
Satisfactory 1, 2, 3, 4 | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	25,730	27,019
Satisfactory 1, 2, 3, 4 | Consumer Loans | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	971	1,077
Satisfactory 1, 2, 3, 4 | Consumer Loans | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	24,759	25,942
Special Mention 5,6
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	12,262	21,295
Special Mention 5,6 | Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	11,593	11,522
Special Mention 5,6 | Real Estate Loans | Land Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	176	192
Special Mention 5,6 | Real Estate Loans | Farmland
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	805	744
Special Mention 5,6 | Real Estate Loans | 1-4 Family Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,910	4,671
Special Mention 5,6 | Real Estate Loans | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	5,702	5,915
Special Mention 5,6 | Business Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	436	434
Special Mention 5,6 | Business Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	430	426
Special Mention 5,6 | Business Loans | Farm Production and Other Farm Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	6	8
Special Mention 5,6 | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	233	193
Special Mention 5,6 | Consumer Loans | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	233	193
Substandard 7
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	33,543	34,414
Substandard 7 | Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	32,777	33,422
Substandard 7 | Real Estate Loans | Land Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,862	1,867
Substandard 7 | Real Estate Loans | Farmland
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	3,689	3,730
Substandard 7 | Real Estate Loans | 1-4 Family Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	13,041	13,710
Substandard 7 | Real Estate Loans | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	14,185	14,115
Substandard 7 | Business Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	285	418
Substandard 7 | Business Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	284	416
Substandard 7 | Business Loans | Farm Production and Other Farm Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1	2
Substandard 7 | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	481	574
Substandard 7 | Consumer Loans | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	17	10
Substandard 7 | Consumer Loans | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	464	564
Doubtful 8
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,122	2,142
Doubtful 8 | Business Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,078	2,100
Doubtful 8 | Business Loans | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,078	2,100
Doubtful 8 | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	44	42
Doubtful 8 | Consumer Loans | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	44	42
Loss 9
Financing Receivable, Recorded Investment [Line Items]
Total gross loans		3
Loss 9 | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans		3
Loss 9 | Consumer Loans | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans		$ 3