Condensed Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Interest income	$ 99,882	$ 127,253	$ 166,467
Interest expense	37,399	55,329	81,383
Net interest expense	62,483	71,924	85,084
Non-interest income	45,901	49,261	59,260
Non-interest expense	133,612	124,335	134,160
Loss before income taxes	(34,353)	(36,728)	(41,014)
Income tax benefit	(181)	10	164
Net loss	(34,172)	(36,738)	(41,178)
Preferred stock dividends in arrears	6,560	6,278	5,934
Preferred stock discount accretion	7,412	7,413	7,412
Net loss available to common equity	(48,144)	(50,429)	(54,524)
Parent Company
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Interest income	5	7	10
Interest expense	19,119	17,498	14,983
Net interest expense	(19,114)	(17,491)	(14,973)
Equity in net loss from subsidiaries	(14,781)	(19,498)	(26,707)
Non-interest income	4	413
Loss from operations	(33,891)	(36,576)	(41,680)
Non-interest expense	687	1,287	935
Loss before income taxes	(34,578)	(37,863)	(42,615)
Income tax benefit	(406)	(1,125)	(1,437)
Net loss	(34,172)	(36,738)	(41,178)
Preferred stock dividends in arrears	(6,560)	(6,278)	(5,934)
Preferred stock discount accretion	(7,412)	(7,413)	(7,412)
Net loss available to common equity	$ (48,144)	$ (50,429)	$ (54,524)