Aging Analysis of Loans Receivable by Segment and Class (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 162,793	$ 165,810
60-89 Days Past Due	44,391	54,339
90 Days or More Past Due Accruing	613	845
90 Days or More Past Non-Accrual	375,727	389,865
Total Past Due	583,524	610,859
Current	12,845,247	13,528,210
Loans (gross) amount	13,428,771	14,139,069
Mortgage loans (gross)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (gross) amount	13,134,600	13,829,729
Mortgage loans (gross) | One to Four Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (gross) amount	10,550,997	10,855,061
Mortgage loans (gross) | One to Four Family | Full Documentation Interest Only Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	41,244	41,608
60-89 Days Past Due	12,431	18,029
90 Days or More Past Non-Accrual	109,683	105,982
Total Past Due	163,358	165,619
Current	3,165,167	3,646,143
Loans (gross) amount	3,328,525	3,811,762
Mortgage loans (gross) | One to Four Family | Full Documentation Amortizing Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	26,353	29,666
60-89 Days Past Due	6,846	5,170
90 Days or More Past Due Accruing		464
90 Days or More Past Non-Accrual	37,590	45,256
Total Past Due	70,789	80,556
Current	5,494,044	5,191,615
Loans (gross) amount	5,564,833	5,272,171
Mortgage loans (gross) | One to Four Family | Reduced Documentation Interest Only Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	35,542	38,864
60-89 Days Past Due	12,478	20,493
90 Days or More Past Non-Accrual	145,816	157,464
Total Past Due	193,836	216,821
Current	1,038,718	1,114,473
Loans (gross) amount	1,232,554	1,331,294
Mortgage loans (gross) | One to Four Family | Reduced Documentation Amortizing Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	15,350	14,965
60-89 Days Past Due	3,406	4,170
90 Days or More Past Non-Accrual	36,470	33,149
Total Past Due	55,226	52,284
Current	369,859	387,550
Loans (gross) amount	425,085	439,834
Mortgage loans (gross) | Multi Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	33,128	33,627
60-89 Days Past Due	6,568	6,056
90 Days or More Past Due Accruing	613	381
90 Days or More Past Non-Accrual	29,275	29,814
Total Past Due	69,584	69,878
Current	1,776,469	2,117,991
Loans (gross) amount	1,846,053	2,187,869
Mortgage loans (gross) | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	7,529	2,925
60-89 Days Past Due	2,173
90 Days or More Past Non-Accrual	6,363	6,529
Total Past Due	16,065	9,454
Current	707,482	762,200
Loans (gross) amount	723,547	771,654
Mortgage loans (gross) | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days or More Past Non-Accrual	5,299	6,097
Total Past Due	5,299	6,097
Current	8,704	9,048
Loans (gross) amount	14,003	15,145
Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (gross) amount	294,171	309,340
Consumer and Other Loans | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,511	3,991
60-89 Days Past Due	432	351
90 Days or More Past Non-Accrual	5,099	5,464
Total Past Due	9,042	9,806
Current	261,051	272,647
Loans (gross) amount	270,093	282,453
Consumer and Other Loans | Other loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	136	164
60-89 Days Past Due	57	70
90 Days or More Past Non-Accrual	132	110
Total Past Due	325	344
Current	23,753	26,543
Loans (gross) amount	$ 24,078	$ 26,887