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Loans and Allowance for Loan Losses (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
First mortgage loans:  
Total first mortgage loans$ 29,752,308$ 30,606,270
Consumer and other loans:  
Total consumer and other loans295,114317,627
Total loans30,047,42230,923,897
One- to four-family, Amortizing [Member]
  
First mortgage loans:  
Total first mortgage loans24,059,30224,912,935
One- to four-family, Interest-only [Member]
  
First mortgage loans:  
Total first mortgage loans4,897,5905,136,463
FHA/VA [Member]
  
First mortgage loans:  
Total first mortgage loans747,459499,724
Multi-family and commercial mortgages [Member]
  
First mortgage loans:  
Total first mortgage loans39,95848,067
Construction loans [Member]
  
First mortgage loans:  
Total first mortgage loans7,9999,081
Fixed-rate second mortgages [Member]
  
Consumer and other loans:  
Total consumer and other loans138,767160,896
Home equity credit lines [Member]
  
Consumer and other loans:  
Total consumer and other loans135,872137,467
Other [Member]
  
Consumer and other loans:  
Total consumer and other loans$ 20,475$ 19,264