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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 | Sep. 30, 2021 | Sep. 30, 2020
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Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | $ 1,515,487 | $ 2,562,765
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | 4,215 | 24,664
Loans receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,515,487 | 2,562,765
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | 4,215 | 24,664
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional | 1,159,033 | 2,849,390
Mortgage loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | 1,864 | 16,049
Hedged asset, discontinued fair value | $ 30,000 |
Hedged asset, discontinued fair value (percent) | 30.00% |
Hedged asset, total last of layer hedge | $ 100,000 |
Unamortized discount, termination portion of hedge | 1,238 |
Mortgage loan fair value hedges | Loans receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,468,517 | 2,461,008
Mortgage loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional | 470,000 | 500,000
Commercial loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | 2,351 | 8,615
Hedged asset, discontinued fair value | 46,240 |
Commercial loan fair value hedges | Loans receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 46,970 | 101,757
Commercial loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional | $ 44,678 | $ 93,316

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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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