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Derivatives and Hedging Activities - Summary of Fair Value, Notional Amount and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Other assets
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 625,607	$ 1,193,323
Derivative assets, fair value	21,989	38,838
Other liabilities
Derivatives, Fair Value [Line Items]
Derivative, notional amount	1,221,252	395,396
Derivative liabilities, fair value	32,546	12,731
Client swap program hedges | Other assets
Derivatives, Fair Value [Line Items]
Derivative, notional amount	425,607	395,396
Derivative assets, fair value	20,381	12,731
Client swap program hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative, notional amount	425,607	395,396
Derivative liabilities, fair value	20,381	12,731
Commercial loan fair value hedges | Other assets
Derivatives, Fair Value [Line Items]
Derivative, notional amount	0	97,927
Derivative assets, fair value	0	3,857
Commercial loan fair value hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative, notional amount	95,645	0
Derivative liabilities, fair value	4,288	0
Mortgage loan fair value hedges | Other assets
Derivatives, Fair Value [Line Items]
Derivative, notional amount	200,000
Derivative assets, fair value	1,608
Mortgage loan fair value hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative, notional amount	0
Derivative liabilities, fair value	0
Borrowings cash flow hedges | Other assets
Derivatives, Fair Value [Line Items]
Derivative, notional amount	0	700,000
Derivative assets, fair value	0	22,250
Borrowings cash flow hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative, notional amount	700,000	0
Derivative liabilities, fair value	$ 7,877	$ 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.

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- 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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Nominal or face amount used to calculate payment on derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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