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Customer Accounts - Interest Expense on Customer Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Banking and Thrift [Abstract]      
Checking accounts $ 1,036 $ 1,259 $ 936
Passbook and statement accounts 660 607 566
Insured money market accounts 3,631 4,574 4,280
Certificate accounts 46,273 52,636 62,669
Interest expense on customer accounts, gross 51,600 59,076 68,451
Less early withdrawal penalties (546) (552) (548)
Interest expense on customer accounts $ 51,054 $ 58,524 $ 67,903
Weighted average interest rate at end of year 0.48% 0.51% 0.69%
Weighted daily average interest rate during the year 0.48% 0.57% 0.75%