Reconciliation of Bank's Stockholders' Equity to Federal Regulatory Capital (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Regulatory Authorities [Line Items]
Stockholders' equity of the Bank	$ 112,796		$ 128,071
Less: Disallowed servicing assets	(1,945)		(2,045)
Accumulated other comprehensive income	(3,579)		(132)
Tier 1 capital	107,272		125,894
Plus: Allowable general valuation allowances	18,187		23,247
Total risk-based capital	$ 125,459	[1]	$ 149,141	[1]

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