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Customer Accounts - Interest Expense on Customer Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Banking and Thrift [Abstract]
Checking accounts	$ 6,072	$ 2,721	$ 1,491
Savings accounts	920	978	734
Money market accounts	7,788	3,592	3,285
Time deposit accounts	58,468	45,256	47,425
Interest expense on customer accounts, gross	73,248	52,547	52,935
Less early withdrawal penalties	(756)	(524)	(450)
Interest expense on customer accounts	$ 72,492	$ 52,023	$ 52,485
Weighted average interest rate at end of year	0.87%	0.54%	0.50%
Weighted daily average interest rate during the year	0.65%	0.49%	0.50%

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The interest expense recognized during the period on customer deposits or security deposits held in interest bearing accounts.

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-Publisher FASB
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Interest expense incurred on demand deposit accounts that represent borrowings rather than outstanding drafts.

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Aggregate amount of interest expense on all deposits.

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Early withdrawal penalties on domestic deposits which discourage customer withdrawal prior to maturity.

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Interest expense incurred on all money market deposits.

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Interest expense incurred on all savings account deposits.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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Weighted average interest rate calculated at point in time for domestic deposit liability.

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Weighted average interest rate calculated over time for domestic deposit liability.

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