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Customer Accounts Interest Expense on Customer Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Banking and Thrift [Abstract]      
Checking accounts $ 1,259 $ 936 $ 857
Passbook and statement accounts 607 566 574
Insured money market accounts 4,574 4,280 4,609
Certificate accounts 52,636 62,669 81,506
Interest expense on customer accounts, gross 59,076 68,451 87,546
Less early withdrawal penalties (552) (548) (607)
Interest expense on customer accounts $ 58,524 $ 67,903 $ 86,939
Weighted average interest rate at end of year 0.51% 0.69% 0.90%
Weighted daily average interest rate during the year 0.57% 0.75% 0.99%