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Other Borrowings (Details) (USD $)
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Reverse repurchase agreements and other borrowings due within 1 year $ 0 $ 0  
Reverse repurchase agreements and other borrowings due from 1 to 3 years 0 300,000,000  
Reverse repurchase agreements and other borrowings due from 4 to 5 years 0 300,000,000  
Reverse repurchase agreements and other borrowings due in more than 5 years 0 200,000,000  
Other borrowings 0 800,000,000  
Callable reverse repurchase agreements and other borrowings 0 500,000,000  
Reverse repurchase agreements and other borrowings due within 1 year 0 200,000,000  
Reverse repurchase agreements and other borrowings due from 1 to 3 years 0 300,000,000  
Reverse repurchase agreements and other borrowings due from 4 to 5 years 0 300,000,000  
Reverse repurchase agreements and other borrowings due in more than 5 years 0 0  
Repurchase agreements with customers 0 800,000,000  
Daily average of securities sold under agreements to repurchase 0.00% 3.90% 3.90%
Weighted daily average interest rate during the year 3.71% 3.73% 3.90%
Daily average of securities sold under agreements to repurchase 692,896,000 800,000,000 800,000,000
Maximum securities sold under agreements to repurchase at any month end 800,000,000 800,000,000 800,000,000
Weighted average interest rate at end of year 25,693,000 29,867,000 29,867,000
Weighted average interest rate at end of year 0.00% 0.00% 0.00%
Weighted daily average interest rate during the year 0.00% 0.00% 4.98%
Daily average of other borrowings 0 0 9,479,000
Maximum other borrowings at any month end 0 0 14,310,000
Interest expense during the year $ 0 $ 0 $ 22,000