Reconciliations of Reportable Segment Revenues Profit or Loss and Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Segment Information [Line Items]
Interest income	$ 99,882	$ 127,253	$ 166,467
Interest expense	37,399	55,329	81,383
Net interest income	62,483	71,924	85,084
Provision for credit losses	9,125	33,578	51,198
Net interest income after provision for credit losses	53,358	38,346	33,886
Other income	45,901	49,261	59,260
Other expense	(133,612)	(124,335)	(134,160)
Loss before income taxes	(34,353)	(36,728)	(41,014)
Income tax expense (benefit)	(181)	10	164
Net income (loss)	(34,172)	(36,738)	(41,178)
Total assets at end of period	2,367,583	2,789,452	3,394,825
Real Estate Investments
Segment Information [Line Items]
Interest income	54	54	83
Net interest income	54	54	83
Net interest income after provision for credit losses	54	54	83
Other income	80	222	92
Other expense	(687)	(886)	(667)
Loss before income taxes	(553)	(610)	(492)
Income tax expense (benefit)	(1,574)	(41)	641
Net income (loss)	1,021	(569)	(1,133)
Total assets at end of period	831	550	518
Community Banking
Segment Information [Line Items]
Interest income	99,828	127,199	166,384
Interest expense	37,399	55,329	81,383
Net interest income	62,429	71,870	85,001
Provision for credit losses	9,125	33,578	51,198
Net interest income after provision for credit losses	53,304	38,292	33,803
Other income	45,826	49,044	59,173
Other expense	(132,930)	(123,454)	(133,498)
Loss before income taxes	(33,800)	(36,118)	(40,522)
Income tax expense (benefit)	1,393	51	(477)
Net income (loss)	(35,193)	(36,169)	(40,045)
Total assets at end of period	2,366,752	2,788,902	3,394,307
Intersegment Eliminations
Segment Information [Line Items]
Other income	(5)	(5)	(5)
Other expense	$ 5	$ 5	$ 5