Summary of Bank's Capital Ratios and Ratios Required by Federal Regulators (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2009	Sep. 30, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual Amount of total risk-based capital	$ 125,459	[1]	$ 149,141	[1]
Actual Ratio of total risk-based capital	9.02%	[1]	8.42%	[1]
Amount of total risk-based capital To be Adequately Capitalized	111,311	[1]	141,701	[1]
Ratio of total risk-based capital To be Adequately Capitalized	8.00%	[1]	8.00%	[1]
Amount of total risk-based capital To be Well Capitalized	139,139	[1]	177,126	[1]
Ratio of total risk-based capital To be Well Capitalized	10.00%	[1]	10.00%	[1]	12.00%	11.00%
Amount of total risk-based capital Under Order to Cease and Desist	166,966	[1]	212,551	[1]
Ratio of total risk-based capital Under Order to Cease and Desist	12.00%	[1]	12.00%	[1]
Tier 1 leverage	107,272		125,894
Leverage
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage	107,272	[2]	125,894	[2]
Actual Ratio of Tier 1 leverage (core)	4.53%	[2]	4.51%	[2]
Amount of Tier 1 leverage To be Adequately Capitalized	94,775	[2]	111,685	[2]
Ratio of Tier 1 leverage To be Adequately Capitalized	4.00%	[2]	4.00%	[2]
Amount of Tier 1 leverage To be Well Capitalized	118,469	[2]	139,606	[2]
Ratio of Tier 1 leverage To be Well Capitalized	5.00%	[2]	5.00%	[2]
Amount of Tier 1 leverage Under Order to Cease and Desist	189,551	[2]	223,370	[2]
Ratio of Tier 1 leverage under order to Cease and Desist	8.00%	[2]	8.00%	[2]
Risk Based Capital
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage	107,272	[3]	125,894	[3]
Actual Ratio of Tier 1 leverage (core)	7.71%	[3]	7.11%	[3]
Amount of Tier 1 leverage To be Adequately Capitalized	55,655	[3]	70,850	[3]
Ratio of Tier 1 leverage To be Adequately Capitalized	4.00%	[3]	4.00%	[3]
Amount of Tier 1 leverage To be Well Capitalized	$ 83,483	[3]	$ 106,276	[3]
Ratio of Tier 1 leverage To be Well Capitalized	6.00%	[3]	6.00%	[3]

[1] Total risk-based capital divided by total risk-weighted assets.

[2] Tier 1 capital divided by adjusted total assets.

[3] Tier 1 capital divided by total risk-weighted assets.