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FHLB Advances and Other Borrowings - FHLB Advances (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Banking and Thrift [Abstract]      
Within 1 year $ 100,000 $ 0  
1 to 3 years 700,000 350,000  
4 to 5 years 730,000 850,000  
More than 5 years 400,000 730,000  
FHLB advances 1,930,000 1,930,000  
Advances that are callable 0 175,000  
Within 1 year 100,000 175,000  
1 to 3 years 700,000 350,000  
4 to 5 years 730,000 775,000  
More than 5 years 400,000 630,000  
Weighted average interest rate at end of year 3.52% 3.52% 3.60%
Weighted daily average interest rate during the year 3.49% 3.57% 4.14%
Daily average of FHLB advances 1,955,205 1,905,479 1,949,019
Maximum amount of FHLB advances at any month end 2,205,000 1,930,000 1,961,895
Interest expense during the year (excludes interest rate swap expense) $ 68,307 $ 68,075 $ 80,617
Credit line total percentage of assets 50.00%