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FHLB Advances and Other Borrowings - Other Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Debt Disclosure [Abstract]      
Other borrowings $ 0 $ 0  
Repurchase agreements with customers 0 0  
Weighted average interest rate at end of year 0.00% 0.00% 3.90%
Weighted daily average interest rate during the year 0.00% 3.71% 3.73%
Daily average of securities sold under agreements to repurchase 0 692,896 800,000
Maximum securities sold under agreements to repurchase at any month end 0 800,000 800,000
Interest expense during the year $ 0 $ 25,693 $ 29,867