Aging of Recorded Investment in Past Due Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
30-59	$ 14,294	$ 18,332
60-89	10,109	12,230
90 or More	92,209	190,663
Total	116,612	221,225
Residential
Financing Receivable, Recorded Investment [Line Items]
30-59	2,028	2,414
60-89	3,390	1,071
90 or More	24,645	37,791
Total	30,063	41,276
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
30-59	1,004	976
60-89	115	539
90 or More	2,212	3,183
Total	3,331	4,698
Land and construction
Financing Receivable, Recorded Investment [Line Items]
30-59	841	37
60-89	456
90 or More	11,777	60,680
Total	13,074	60,717
Multi-family
Financing Receivable, Recorded Investment [Line Items]
30-59	2,170	360
60-89	856	541
90 or More	17,619	26,371
Total	20,645	27,272
Retail/office
Financing Receivable, Recorded Investment [Line Items]
30-59	2,160	2,627
60-89	653	2,634
90 or More	12,263	14,033
Total	15,076	19,294
Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
30-59	10	1,884
60-89	55	191
90 or More	5,873	16,323
Total	5,938	18,398
Education
Financing Receivable, Recorded Investment [Line Items]
30-59	4,414	8,370
60-89	3,853	6,562
90 or More	14,121	25,403
Total	22,388	40,335
Other consumer
Financing Receivable, Recorded Investment [Line Items]
30-59	1,667	1,664
60-89	731	692
90 or More	3,699	6,879
Total	$ 6,097	$ 9,235