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Derivatives and Hedging Activities - Impact of Fair Value Hedge Accounting on the Carrying Value of the Hedged Items (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | $ 1,272,018 | $ 1,515,487
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (18,845) | 4,215
Loans Receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,272,018 | 1,515,487
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (18,845) | 4,215
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 658,039 | 1,159,033
Mortgage loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (19,000) | 1,900
Notional amount | 470,000 |
Hedged asset, discontinued |  | $ 30,000
Hedged asset, discontinued, percentage |  | 30.00%
Hedged asset, discontinued, last layer hedge |  | $ 100,000
Mortgage loan fair value hedges | Loans Receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,230,000 | 1,469,000
Mortgage loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 0 | 470,000
Commercial loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | 100 | 2,400
Hedged asset, discontinued, last layer hedge |  | 46,000
Commercial loan fair value hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | 1,000 |
Commercial loan fair value hedges | Loans Receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 42,000 | 47,000
Commercial loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | $ 42,209 | $ 44,678

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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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