Loans - Schedule of Aging of Past Due and Nonaccrual Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 373,857	$ 359,799
30 - 59 Days Past Due	1,455	705
60 - 89 Days Past Due	238	500
90 Days + Past Due	135	131
Non- Accrual	2,258	3,206
Total Past Due and Non- Accrual	4,086	4,542
Total ending loans balance	377,943	364,341
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	116,588	104,348
30 - 59 Days Past Due	105	60
60 - 89 Days Past Due	152	8
Non- Accrual	53	483
Total Past Due and Non- Accrual	310	551
Total ending loans balance	116,898	104,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	127,247	117,372
30 - 59 Days Past Due	583	41
60 - 89 Days Past Due		34
Non- Accrual	1,183	1,745
Total Past Due and Non- Accrual	1,766	1,820
Total ending loans balance	129,013	119,192
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	109,396	108,574
30 - 59 Days Past Due	616	472
60 - 89 Days Past Due	25	430
90 Days + Past Due	133	131
Non- Accrual	1,016	805
Total Past Due and Non- Accrual	1,790	1,838
Total ending loans balance	111,186	110,412
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	14,050	23,180
60 - 89 Days Past Due		5
Non- Accrual	6	173
Total Past Due and Non- Accrual	6	178
Total ending loans balance	14,056	23,358
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	6,576	6,325
30 - 59 Days Past Due	151	132
60 - 89 Days Past Due	61	23
90 Days + Past Due	2
Total Past Due and Non- Accrual	214	155
Total ending loans balance	$ 6,790	$ 6,480