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FHLB Advances (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Within 1 year $ 0 $ 0  
1 to 3 years 100,000 0  
4 to 5 years 500,000 1,212,066  
More than 5 years 1,280,000 750,000  
FHLB advances 1,880,000 1,962,066  
Advances that are callable 450,000 1,150,000  
Within 1 year 275,000 1,100,000  
1 to 3 years 275,000 450,000  
4 to 5 years 500,000 412,066  
More than 5 years 830,000 0  
Weighted average interest rate at end of year 3.60% 4.10% 4.24%
Weighted daily average interst rate during the year 4.14% 4.35% 4.46%
Daily average of FHLB advances 1,949,019 1,883,135 2,070,843
Maximum amount of FHLB advances at any month end 1,961,895 1,962,616 2,078,695
Interest expense during the year $ 80,617 $ 81,994 $ 92,402
Credit line total percentage of assets 50.00%