Loans Receivable Held For Investment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	$ 1,763,196		$ 2,188,083
Allowance for loan losses	(79,815)		(111,215)
Undisbursed loan proceeds	(10,997)	[1]	(16,034)	[1]
Unamortized loan fees, net	(1,838)		(3,086)
Unearned interest	(3)		(4)
Total loan contra balances	(92,653)		(130,339)
Loans held for investment	1,670,543		2,057,744
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	547,720		564,427
Allowance for loan losses	(14,525)		(13,027)
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	30,574		38,977
Allowance for loan losses	(7,072)		(10,568)
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	770,943		1,074,816
Allowance for loan losses	(54,581)		(85,153)
Commercial Real Estate | Land and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	111,953		186,048
Commercial Real Estate | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	287,447		342,216
Commercial Real Estate | Retail/office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	198,686		298,277
Commercial Real Estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	172,857		248,275
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	413,959		509,863
Allowance for loan losses	(3,637)		(2,467)
Consumer | Education
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	166,429		240,331
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Unpaid Principal Balance	$ 247,530		$ 269,532

[1] Undisbursed loan proceeds are funds to be released upon a draw request approved by the Corporation.