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Derivatives and Hedging Activities - Gains/(Losses) on Derivative Instruments in Fair Value and Cash Flow Accounting Hedging Relationships (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Interest income on loans receivable	$ 149,113	$ 134,193	$ 426,882	$ 400,621
Interest expense on FHLB advances	(6,118)	(9,937)	(21,486)	(35,126)
Interest rate contracts | Interest income on loans receivable | Fair value hedging
Gain/(loss) on fair value hedging relationships:
Amounts related to interest settlements on derivatives	(394)	(1,582)	(2,964)	(4,686)
Recognized on derivatives	8,325	(6,262)	31,386	15,816
Recognized on hedged items	(8,564)	6,292	(31,625)	(15,541)
Net income/(expense) recognized on fair value hedges	(633)	(1,552)	(3,203)	(4,411)
Interest rate contracts | Interest expense on FHLB advances | Cash flow hedging
Gain/(loss) on cash flow hedging relationships:
Amounts related to interest settlements on derivatives	21	2,182	3,757	8,846
Reclassification adjustment of net (gain)/loss included in net income	0	0	0	14,110
Net income/(expense) recognized on cash flow hedges	$ 21	$ 2,182	$ 3,757	$ 22,956

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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