Loans Receivable and Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Loans receivable and allowance for loan losses
30-59 Days Past Due	$ 144,932	$ 166,740
60-89 Days Past Due	36,947	48,815
90 Days or More Past Due Accruing	328	162
90 Days or More Past Due Non-Accrual	314,758	332,695
Total Past Due or Non-Accrual	496,965	548,412
Current	12,658,949	12,649,148
Total loans	13,155,914	13,197,560
Loans (gross), Percent of Total	100.00%	100.00%
Net unamortized premiums and deferred loan origination costs	68,058	77,044
Loans receivable	13,223,972	13,274,604
Allowance for loan losses	(145,501)	(157,185)	(201,499)	(194,049)
Loans receivable, net	13,078,471	13,117,419
Consumer and Other Loans
Loans receivable and allowance for loan losses
30-59 Days Past Due	3,223	4,187
60-89 Days Past Due	1,315	1,587
90 Days or More Past Due Non-Accrual	6,508	6,068
Total Past Due or Non-Accrual	11,046	11,842
Current	253,048	270,602
Total loans	264,094	282,444
Loans (gross), Percent of Total	2.01%	2.14%
Allowance for loan losses	(6,316)	(3,800)	(4,146)	(6,978)
Consumer and Other Loans | Home Equity
Loans receivable and allowance for loan losses
30-59 Days Past Due	3,103	3,975
60-89 Days Past Due	1,092	1,391
90 Days or More Past Due Non-Accrual	6,459	5,995
Total Past Due or Non-Accrual	10,654	11,361
Current	221,266	247,675
Total loans	231,920	259,036
Loans (gross), Percent of Total	1.77%	1.96%
Consumer and Other Loans | Other Loans
Loans receivable and allowance for loan losses
30-59 Days Past Due	120	212
60-89 Days Past Due	223	196
90 Days or More Past Due Non-Accrual	49	73
Total Past Due or Non-Accrual	392	481
Current	31,782	22,927
Total loans	32,174	23,408
Loans (gross), Percent of Total	0.24%	0.18%
Mortgage Loans (Gross)
Loans receivable and allowance for loan losses
30-59 Days Past Due	141,709	162,553
60-89 Days Past Due	35,632	47,228
90 Days or More Past Due Accruing	328	162
90 Days or More Past Due Non-Accrual	308,250	326,627
Total Past Due or Non-Accrual	485,919	536,570
Current	12,405,901	12,378,546
Total loans	12,891,820	12,915,116
Loans (gross), Percent of Total	97.99%	97.86%
Mortgage Loans (Gross) | Residential
Loans receivable and allowance for loan losses
30-59 Days Past Due	106,430	128,562
60-89 Days Past Due	27,124	31,253
90 Days or More Past Due Accruing		14
90 Days or More Past Due Non-Accrual	291,051	317,853
Total Past Due or Non-Accrual	424,605	477,682
Current	9,286,621	10,083,857
Total loans	9,711,226	10,561,539
Loans (gross), Percent of Total	73.82%	80.02%
Allowance for loan losses	(89,267)	(105,991)	(125,524)	(113,288)
Mortgage Loans (Gross) | Residential | Full Documentation Interest-only Loans
Loans receivable and allowance for loan losses
30-59 Days Past Due	30,520	40,582
60-89 Days Past Due	8,973	9,047
90 Days or More Past Due Non-Accrual	99,521	107,503
Total Past Due or Non-Accrual	139,014	157,132
Current	1,862,382	2,538,808
Total loans	2,001,396	2,695,940
Loans (gross), Percent of Total	15.21%	20.43%
Mortgage Loans (Gross) | Residential | Full Documentation Amortizing Loans
Loans receivable and allowance for loan losses
30-59 Days Past Due	35,918	33,376
60-89 Days Past Due	6,564	7,056
90 Days or More Past Due Accruing		14
90 Days or More Past Due Non-Accrual	44,326	43,923
Total Past Due or Non-Accrual	86,808	84,369
Current	6,218,064	6,223,678
Total loans	6,304,872	6,308,047
Loans (gross), Percent of Total	47.93%	47.79%
Mortgage Loans (Gross) | Residential | Reduced Documentation Interest-only Loans
Loans receivable and allowance for loan losses
30-59 Days Past Due	28,212	38,570
60-89 Days Past Due	7,694	9,695
90 Days or More Past Due Non-Accrual	113,482	131,301
Total Past Due or Non-Accrual	149,388	179,566
Current	855,907	965,774
Total loans	1,005,295	1,145,340
Loans (gross), Percent of Total	7.64%	8.68%
Mortgage Loans (Gross) | Residential | Reduced Documentation Amortizing Loans
Loans receivable and allowance for loan losses
30-59 Days Past Due	11,780	16,034
60-89 Days Past Due	3,893	5,455
90 Days or More Past Due Non-Accrual	33,722	35,126
Total Past Due or Non-Accrual	49,395	56,615
Current	350,268	355,597
Total loans	399,663	412,212
Loans (gross), Percent of Total	3.04%	3.12%
Mortgage Loans (Gross) | Multi-Family
Loans receivable and allowance for loan losses
30-59 Days Past Due	21,743	29,109
60-89 Days Past Due	5,382	14,915
90 Days or More Past Due Accruing		148
90 Days or More Past Due Non-Accrual	10,658	7,874
Total Past Due or Non-Accrual	37,783	52,046
Current	2,368,895	1,641,825
Total loans	2,406,678	1,693,871
Loans (gross), Percent of Total	18.29%	12.84%
Allowance for loan losses	(35,514)	(35,422)	(56,266)	(63,145)
Mortgage Loans (Gross) | Commercial Real Estate
Loans receivable and allowance for loan losses
30-59 Days Past Due	13,536	4,882
60-89 Days Past Due	3,126	1,060
90 Days or More Past Due Accruing	328
90 Days or More Past Due Non-Accrual	6,541	900
Total Past Due or Non-Accrual	23,531	6,842
Current	750,385	652,864
Total loans	773,916	659,706
Loans (gross), Percent of Total	5.88%	5.00%
Allowance for loan losses	$ (14,404)	$ (11,972)	$ (15,563)	$ (10,638)