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Customer Accounts Interest Expense on Customer Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Checking accounts $ 857 $ 1,908 $ 2,299
Passbook and statement accounts 574 682 1,100
Insured money market accounts 4,609 7,148 12,121
Certificate accounts 81,506 106,878 131,567
Interest expense on customer accounts 87,546 116,616 147,087
Less early withdrawal penalties (607) (781) (727)
Interest Expense, Customer Deposits $ 86,939 $ 115,835 $ 146,360
Weighted average interest rate at end of year 0.90% 1.14% 1.51%
Weighted daily average interest rate during the year 0.99% 1.32% 1.69%