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Derivatives and Hedging Activities - Summary of Fair Value, Notional Amount and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Other assets
Derivatives, Fair Value [Line Items]
Notional amount	$ 2,093,443	$ 2,100,885
Derivative assets, fair value	272,955	286,487
Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	583,782	588,676
Derivative liabilities, fair value	63,383	67,260
Client swap program hedges | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	583,782	588,676
Derivative assets, fair value	63,383	67,260
Client swap program hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	583,782	588,676
Derivative liabilities, fair value	63,383	67,260
Commercial loan fair value hedges | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	39,661	42,209
Derivative assets, fair value	2,447	2,517
Commercial loan fair value hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	0	0
Derivative liabilities, fair value	0	0
Mortgage loan fair value hedges
Derivatives, Fair Value [Line Items]
Notional amount	470,000
Mortgage loan fair value hedges | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	470,000	470,000
Derivative assets, fair value	33,986	36,765
Mortgage loan fair value hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	0	0
Derivative liabilities, fair value	0	0
Borrowings cash flow hedges | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	1,000,000	1,000,000
Derivative assets, fair value	173,139	179,945
Borrowings cash flow hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	0	0
Derivative liabilities, fair value	$ 0	$ 0

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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