Allowance for Loan Losses - Age Analysis of Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	$ 3,585	$ 5,217
Loans 60 - 89 Days Past Due	1,182	2,120
Loans 90+ Days Past Due	7,925	11,082
Total Past Due	12,692	18,419
Current	573,982	548,303
Total Loans	586,674	566,722	594,030
Accruing Loans 90 Days Past Due	0	0
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	0	0
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	0	0
Total Past Due	0	0
Current	22,266	13,815
Total Loans	22,266	13,815
Accruing Loans 90 Days Past Due	0	0
Land, Farmland, Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	31	65
Loans 60 - 89 Days Past Due	0	32
Loans 90+ Days Past Due	0	119
Total Past Due	31	216
Current	17,077	13,786
Total Loans	17,108	14,002
Accruing Loans 90 Days Past Due	0	0
Residential / Prime [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	1,233	2,316
Loans 60 - 89 Days Past Due	648	906
Loans 90+ Days Past Due	3,584	5,212
Total Past Due	5,465	8,434
Current	211,237	210,217
Total Loans	216,702	218,651
Accruing Loans 90 Days Past Due	0	0
Residential / Subprime [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	1,606	2,509
Loans 60 - 89 Days Past Due	533	1,181
Loans 90+ Days Past Due	3,554	4,562
Total Past Due	5,693	8,252
Current	46,872	48,993
Total Loans	52,565	57,245
Accruing Loans 90 Days Past Due	0	0
Commercial and Non-Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	58	0
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	778	1,095
Total Past Due	836	1,095
Current	138,702	135,784
Total Loans	139,538	136,879
Accruing Loans 90 Days Past Due	0	0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	36	100
Loans 60 - 89 Days Past Due	1	1
Loans 90+ Days Past Due	7	28
Total Past Due	44	129
Current	5,327	3,919
Total Loans	5,371	4,048
Accruing Loans 90 Days Past Due	0	0
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	7	0
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	2	66
Total Past Due	9	66
Current	54,862	42,028
Total Loans	54,871	42,094
Accruing Loans 90 Days Past Due	0	0
Multi Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	614	227
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	0	0
Total Past Due	614	227
Current	77,639	79,761
Total Loans	78,253	79,988
Accruing Loans 90 Days Past Due	$ 0	$ 0