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Customer Accounts - Time Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Time deposits by rate band are as follows:
Less than 1.00%	$ 21,281	$ 629,589
1.00% to 1.99%	3,588,689	3,761,543
2.00% to 2.99%	1,294,889	413,671
3.00% to 3.99%	2,104	0
Time deposits by maturity band are as follows:
Within 1 year	3,489,839	2,800,978
1 to 2 years	925,170	1,335,242
2 to 3 years	294,990	296,238
Over 3 years	196,964	372,345
Total time deposits	4,906,963	4,804,803
Customer accounts over $250,000	$ 3,609,961	$ 3,088,231

X

- Definition

Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
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- 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

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-SubTopic 210
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-Subparagraph (SX 210.9-03.12)
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Certificate Accounts [Abstract]

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Customer Accounts Greater than $250,000

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- Definition

Time Deposit Maturities, After Year 3

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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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