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FHLB Advances and Other Borrowings - FHLB Advances (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Banking and Thrift [Abstract]      
Within 1 year $ 0 $ 0  
1 to 3 years 350,000 100,000  
4 to 5 years 850,000 500,000  
More than 5 years 730,000 1,280,000  
Advances that are callable 175,000 450,000  
Within 1 year 175,000 275,000  
1 to 3 years 350,000 275,000  
4 to 5 years 775,000 500,000  
More than 5 years 630,000 830,000  
FHLB advances 1,930,000 1,880,000  
Weighted average interest rate at end of year 3.52% 3.60% 4.10%
Weighted daily average interest rate during the year 3.57% 4.14% 4.35%
Daily average of FHLB advances 1,905,479 1,949,019 1,883,135
Maximum amount of FHLB advances at any month end 1,930,000 1,961,895 1,962,616
Interest expense during the year (excludes interest rate swap expense) $ 68,075 $ 80,617 $ 81,994
Credit line total percentage of assets 50.00%