Loans - Schedule of Aging of Past Due and Nonaccrual Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 371,718	$ 359,799
30 - 59 Days Past Due	2,530	705
60 - 89 Days Past Due	558	500
90 Days + Past Due	36	131
Non- Accrual	2,332	3,206
Total Past Due and Non- Accrual	5,456	4,542
Total ending loans balance	377,174	364,341
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	115,714	104,348
30 - 59 Days Past Due	405	60
60 - 89 Days Past Due		8
90 Days + Past Due
Non- Accrual	71	483
Total Past Due and Non- Accrual	476	551
Total ending loans balance	116,190	104,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	124,753	117,372
30 - 59 Days Past Due	271	41
60 - 89 Days Past Due	216	34
90 Days + Past Due
Non- Accrual	1,183	1,745
Total Past Due and Non- Accrual	1,670	1,820
Total ending loans balance	126,423	119,192
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	110,681	108,574
30 - 59 Days Past Due	767	472
60 - 89 Days Past Due	257	430
90 Days + Past Due	36	131
Non- Accrual	1,078	805
Total Past Due and Non- Accrual	2,138	1,838
Total ending loans balance	112,819	110,412
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,954	23,180
30 - 59 Days Past Due	950
60 - 89 Days Past Due		5
90 Days + Past Due
Non- Accrual		173
Total Past Due and Non- Accrual	950	178
Total ending loans balance	14,904	23,358
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	6,616	6,325
30 - 59 Days Past Due	137	132
60 - 89 Days Past Due	85	23
90 Days + Past Due
Non- Accrual
Total Past Due and Non- Accrual	222	155
Total ending loans balance	$ 6,838	$ 6,480