Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Operating Activities
Net loss	$ (34,172)	$ (36,738)	$ (41,178)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Net cash provided by (used in) operating activities	40,166	7,236	63,989
Investing Activities
Proceeds from sales of investment securities available for sale	12,262	338,224	385,924
Net cash provided by (used in) investing activities	344,144	746,149	229,019
Financing Activities
Net cash provided by (used in) financing activities	(398,754)	(617,420)	(698,155)
Increase (decrease) in cash and cash equivalents	(14,444)	135,965	(405,147)
Cash and cash equivalents at beginning of period	242,980	107,015	512,162
Cash and cash equivalents at end of period	228,536	242,980	107,015
Parent Company
Operating Activities
Net loss	(34,172)	(36,738)	(41,178)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Equity in net loss of subsidiaries	14,781	19,498	26,707
Other	15,558	17,205	17,589
Net cash provided by (used in) operating activities	(3,833)	(35)	3,118
Investing Activities
Proceeds from sales of investment securities available for sale
Net decrease in loans receivable from non-bank subsidiaries	4,225		375
Capital contribution to Bank subsidiary			(2,000)
Capital contribution to non-Bank subsidiary
Net cash provided by (used in) investing activities	4,225		(1,625)
Financing Activities
Issuance of treasury stock related to equity compensation plans			6
Purchase of remaining ESOP shares			(8)
Net cash provided by (used in) financing activities			(2)
Increase (decrease) in cash and cash equivalents	392	(35)	1,491
Cash and cash equivalents at beginning of period	2,584	2,619	1,128
Cash and cash equivalents at end of period	$ 2,976	$ 2,584	$ 2,619