Allowance for Loan Losses - Age Analysis of Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	$ 4,013	$ 5,217
Loans 60 - 89 Days Past Due	943	2,120
Loans 90+ Days Past Due	9,045	11,082
Total Past Due	14,001	18,419
Current	557,469	548,303
Total Loans	571,470	566,722	613,790
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	11,414	13,815
Total Loans	11,414	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	0	65
Loans 60 - 89 Days Past Due	0	32
Loans 90+ Days Past Due	182	119
Total Past Due	182	216
Current	16,582	13,786
Total Loans	16,764	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	1,954	2,316
Loans 60 - 89 Days Past Due	277	906
Loans 90+ Days Past Due	3,783	5,212
Total Past Due	6,014	8,434
Current	205,394	210,217
Total Loans	211,408	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	2,015	2,509
Loans 60 - 89 Days Past Due	665	1,181
Loans 90+ Days Past Due	3,916	4,562
Total Past Due	6,596	8,252
Current	47,478	48,993
Total Loans	54,074	57,245
Accruing Loans 90 Days Past Due	0	0
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	37	0
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	1,066	1,095
Total Past Due	1,103	1,095
Current	141,239	135,784
Total Loans	142,342	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	7	100
Loans 60 - 89 Days Past Due	1	1
Loans 90+ Days Past Due	33	28
Total Past Due	41	129
Current	4,657	3,919
Total Loans	4,697	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	0	0
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	65	66
Total Past Due	65	66
Current	50,113	42,028
Total Loans	50,178	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	0	227
Loans 60 - 89 Days Past Due	0	0
Loans 90+ Days Past Due	0	0
Total Past Due	0	227
Current	80,592	79,761
Total Loans	80,593	79,988
Accruing Loans 90 Days Past Due	$ 0	$ 0