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Derivatives and Hedging Activities - Impact of Fair Value Hedge Accounting on the Carrying Value of the Hedged Items (Details) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Loans receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | $ 1,159,496,000 | $ 1,515,487,000
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (39,090,000) | 4,215,000
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional | 588,676,000 | 1,159,033,000
Mortgage loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (36,458,000) | 1,864,000
Hedged asset, discontinued fair value |  | $ 30,000,000
Hedged asset, discontinued fair value (percent) |  | 3000.00%
Hedged asset, total last of layer hedge |  | $ 100,000,000
Unamortized discount, termination portion of hedge |  | 1,238,000
Mortgage loan fair value hedges | Loans receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,119,975,000 |
Hedged liability, amortized cost |  | 1,468,517,000
Mortgage loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional | 0 | 470,000,000
Commercial loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (2,632,000) | 2,351,000
Hedged asset, discontinued fair value |  | 46,240,000
Commercial loan fair value hedges | Loans receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 39,521,000 | 46,970,000
Commercial loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional | $ 0 | $ 44,678,000

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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 https://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 https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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