Schedule of Regulatory Capital Requirements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1(Core) capital to adjusted total assets required under cease and desist order, ratio	8.00%	8.00%
Total capital to risk weighted assets required under cease and desist order, ratio	12.00%	12.00%
Tier 1(Core) capital to adjusted total assets required under cease and desist order	$ 29,881	$ 34,111
Total capital to risk weighted assets required under cease and desist order	30,135	36,039
Tier 1(Core) capital to adjusted total assets required to be well capitalized under prompt corrective action regulations, ratio	5.00%	5.00%
Tier 1(Core) capital to risk weighted assets required to be capitalized under prompt corrective action regulations, ratio	6.00%	6.00%
Total capital to risk weighted assets required to be well capitalized under prompt corrective action regulations, ratio	10.00%	10.00%
Tier 1(Core) capital to adjusted total assets required to be well capitalized under prompt corrective action regulations	18,675	21,319
Tier 1(Core) capital to risk weighted assets required to be well capitalized under prompt corrective action regulations	15,067	18,019
Total capital to risk weighted assets required to be well capitalized under prompt corrective action regulations	25,112	30,032
Tangible capital required for capital adequacy purposes, ratio	1.50%	1.50%
Tier 1(Core) capital to adjusted total assets required for capital adequacy purposes, ratio	4.00%	4.00%
Total capital to risk weighted assets required for capital adequacy purposes, ratio	8.00%	8.00%
Tangible capital required to be well capitalized under prompt corrective actions regulations	5,603	6,396
Tier 1(Core) capital to adjusted total assets required for capital adequacy purposes	14,940	17,055
Total capital to risk weighted assets required for capital adequacy purposes	20,090	24,026
Tangible capital to adjusted total assets, ratio	8.82%	7.27%
Tier 1(Core) capital to adjusted total assets, ratio	8.82%	7.27%
Tier 1(Core) capital to risk weighted assets, ratio	13.12%	10.31%
Total capital to risk weighted assets, ratio	14.41%	11.61%
Tangible capital to adjusted total assets	32,936	30,961
Tier 1(Core) capital to adjusted total assets	32,936	30,961
Tier 1(Core) capital to risk weighted assets	32,936	30,961
Total capital to risk weighted assets	$ 36,183	$ 34,882