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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Assets Measured on Recurring Basis | The following tables present the balance and level in the fair value hierarchy for assets and liabilities that are measured at fair value on a recurring basis (with the exception of those measured using the NAV practical expedient).
| September 30, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |
U.S. government and agency securities | $— |  | $235,919 |  | $— |  | $235,919
Asset-backed securities | — |  | 506,334 |  |  |  | 506,334
Municipal bonds | — |  | 35,258 |  | — |  | 35,258
Corporate debt securities | — |  | 152,537 |  | — |  | 152,537
Mortgage-backed securities |  |  |  |  |  |  |
Agency pass-through certificates | — |  | 2,603,153 |  | — |  | 2,603,153
Total Available-for-sale securities | — |  | 3,533,201 |  | — |  | 3,533,201
Client swap program hedges | — |  | 37,347 |  | — |  | 37,347
Commercial loan hedges | — |  | 1,611 |  | — |  | 1,611
Mortgage loan fair value hedges | — |  | 13,082 |  | — |  | 13,082
Borrowings cash flow hedges | — |  | 99,231 |  | — |  | 99,231
Total Financial Assets | $— |  | $3,684,472 |  | $— |  | $3,684,472
Financial Liabilities |  |  |  |  |  |  |
Client swap program hedges | $— |  | $37,818 |  | $— |  | $37,818
Mortgage backed securities fair value hedges | — |  | 15,086 |  | — |  | 15,086
Mortgage loan fair value hedges | — |  | 20,426 |  | — |  | 20,426
Total Financial Liabilities | $— |  | $73,330 |  | $— |  | $73,330
| September 30, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |
U.S. government and agency securities | $— |  | $314,204 |  | $— |  | $314,204
Asset-backed securities | — |  | 540,125 |  | — |  | 540,125
Municipal bonds | — |  | 35,073 |  | — |  | 35,073
Corporate debt securities | — |  | 296,282 |  | — |  | 296,282
Mortgage-backed securities |  |  |  |  |  |  |
Agency pass-through certificates | — |  | 1,387,025 |  | — |  | 1,387,025
Total Available-for-sale securities | — |  | 2,572,709 |  | — |  | 2,572,709
Client swap program hedges | — |  | 46,758 |  | — |  | 46,758
Commercial loan fair value hedges | — |  | 1,595 |  | — |  | 1,595
Borrowings cash flow hedges | — |  | 117,271 |  | — |  | 117,271
Total Financial Assets | $— |  | $2,738,333 |  | $— |  | $2,738,333
Financial Liabilities |  |  |  |  |  |  |
Client swap program hedges | $— |  | $47,388 |  | $— |  | $47,388
Mortgage loan fair value hedges | — |  | 667 |  | — |  | 667
Total Financial Liabilities | $— |  | $48,055 |  | $— |  | $48,055
Schedule of Aggregated Balance of Assets Measured at Estimated Fair Value on a Nonrecurring Basis and Total Losses Resulting from those Fair Value Adjustments | The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis for the periods presented, and the total losses resulting from those fair value adjustments during the respective periods. The estimated fair value measurements are shown gross of estimated selling costs.
| September 30, 2025 |  | Twelve Months Ended September 30, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total | Total Gains (Losses) |
| (In thousands) |
Loans receivable (1) | $— |  | $— |  | $32,748 |  | $32,748 |  | $(12,056)
Real estate owned (2) | — |  | — |  | 4,810 |  | 4,810 |  | (670)
Balance at end of period | $— |  | $— |  | $37,558 |  | $37,558 |  | $(12,726)
(1)The gains (losses) represent re-measurements of collateral-dependent impaired loans. (2)The gains (losses) represent aggregate write-downs and charge-offs on real estate owned.
| September 30, 2024 |  | Twelve Months Ended September 30, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total | Total Gains (Losses) |
| (In thousands) |
Loans receivable (1) | $— |  | $— |  | $4,345 |  | $4,345 |  | $(3,225)
Real estate owned (2) | — |  | — |  | 1,460 |  | 1,460 |  | (1,910)
Balance at end of period | $— |  | $— |  | $5,805 |  | $5,805 |  | $(5,135)
(1)The gains (losses) represent re-measurements of collateral-dependent impaired loans. (2)The gains (losses) represent aggregate write-downs and charge-offs on real estate owned.
Schedule of Fair Value of Financial Instruments by Balance Sheet Grouping | Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below.
|  | September 30, 2025 |  | September 30, 2024
| Level | Carrying Amount | Estimated Fair Value |  | Carrying Amount | Estimated Fair Value
|  | (In thousands)
Financial assets |  |  |  |  |  |
Cash and cash equivalents | 1 | $657,310 | $657,310 |  | $2,381,102 | $2,381,102
Available-for-sale securities: |  |  |  |  |  |
U.S. government and agency securities | 2 | 235,919 | 235,919 |  | 314,204 | 314,204
Asset-backed securities | 2 | 506,334 | 506,334 |  | 540,125 | 540,125
Municipal bonds | 2 | 35,258 | 35,258 |  | 35,073 | 35,073
Corporate debt securities | 2 | 152,537 | 152,537 |  | 296,282 | 296,282
Mortgage-backed securities |  |  |  |  |  |
Agency pass-through certificates | 2 | 2,603,153 | 2,603,153 |  | 1,387,025 | 1,387,025
Total available-for-sale securities |  | 3,533,201 | 3,533,201 |  | 2,572,709 | 2,572,709
Held-to-maturity securities: |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |
Agency pass-through certificates | 2 | 645,802 | 612,739 |  | 436,972 | 401,046
Total held-to-maturity securities |  | 645,802 | 612,739 |  | 436,972 | 401,046
Loans receivable | 3 | 20,088,618 | 19,681,909 |  | 20,916,354 | 20,269,059
FHLB stock | 2 | 88,068 | 88,068 |  | 95,617 | 95,617
Other assets - client swap program hedges | 2 | 37,347 | 37,347 |  | 46,758 | 46,758
Other assets - commercial loan fair value hedges | 2 | 1,611 | 1,611 |  | 1,595 | 1,595
Other assets - mortgage loan fair value hedges | 2 | 13,082 | 13,082 |  | — | —
Other assets - borrowings cash flow hedges | 2 | 99,231 | 99,231 |  | 117,271 | 117,271
Financial liabilities |  |  |  |  |  |
Time deposits | 2 | 9,131,104 | 9,121,470 |  | 9,556,785 | 9,787,187
Borrowings | 2 | 1,765,604 | 1,755,130 |  | 3,267,589 | 3,276,122
Junior subordinated deferrable interest debentures | 3 | 51,645 | 50,925 |  | 50,718 | 50,240
Other liabilities - client swap program hedges | 2 | 37,818 | 37,818 |  | 47,388 | 47,388
Other liabilities - mortgage backed securities fair value hedges | 2 | 15,086 | 15,086 |  | — | —
Other liabilities - mortgage loan fair value hedges | 2 | 20,426 | 20,426 |  | 667 | 667

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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