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Customer Accounts - Time Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Time deposits by rate band are as follows:
Less than 1.00%	$ 3,153,788	$ 920,220
1.00% to 1.99%	229,594	2,967,345
2.00% to 2.99%	50,608	85,533
3.00% to 3.99%	97	94
Time deposits by maturity band are as follows:
Three months or less	1,085,001	1,238,184
Over 3 through 6 months	819,906	1,282,051
Over 6 through 12 months	870,801	607,181
Over 12 months	658,379	845,776
Time Deposits, Total	$ 3,434,087	$ 3,973,192

X

- Definition

Amount of time deposit liabilities, including certificates of deposit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Certificate Accounts [Abstract]

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- Definition

Time Deposit Maturities, After Twelve Months

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- Definition

Time Deposit Maturities, Six Months To Twelve Months

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- Definition

Time Deposit Maturities, Three Months Or Less

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- Definition

Time Deposit Maturities, Three Months To Six Months

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- Definition

Time Deposits, From One Percent to Less than Two Percent

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Time Deposits, From Three Percent to Less than Four Percent

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Time Deposits, From Two Percent to Less than Three Percent

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Time Deposits, Less than One Percent

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