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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2023
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, 2023
Level 1Level 2Level 3Total
(In thousands)
Available-for-sale securities
U.S. government and agency securities$— $217,053 $— $217,053 
Asset-backed securities— 588,016 588,016 
Municipal bonds— 34,662 — 34,662 
Corporate debt securities— 242,522 — 242,522 
Mortgage-backed securities
Agency pass-through certificates— 912,844 — 912,844 
Total Available-for-sale securities— 1,995,097 — 1,995,097 
  Client swap program hedges— 78,797 — 78,797 
  Commercial loan hedges— 3,405 — 3,405 
  Mortgage loan fair value hedges— 46,396 — 46,396 
  Borrowings cash flow hedges— 184,373 — 184,373 
Total Financial Assets$— $2,308,068 $— $2,308,068 
Financial Liabilities
  Client swap program hedges$— $79,668 $— $79,668 
Total Financial Liabilities$— $79,668 $— $79,668 
September 30, 2022
Level 1Level 2Level 3Total
(In thousands)
Available-for-sale securities
U.S. government and agency securities$— $39,354 $— $39,354 
Asset-backed securities— 767,001 — 767,001 
Municipal bonds— 34,962 — 34,962 
Corporate debt securities— 313,757 — 313,757 
Mortgage-backed securities
Agency pass-through certificates— 895,963 — 895,963 
Total Available-for-sale securities— 2,051,037 — 2,051,037 
  Client swap program hedges— 67,260 — 67,260 
  Commercial loan fair value hedges— 2,517 — 2,517 
  Mortgage loan fair value hedge— 36,765 — 36,765 
  Borrowings cash flow hedges— 179,945 — 179,945 
Total Financial Assets$— $2,337,524 $— $2,337,524 
Financial Liabilities
  Client swap program hedges$— $67,260 $— $67,260 
Total Financial Liabilities$— $67,260 $— $67,260 
Schedule of Aggregated Balance of Assets Measured at Estimated Fair Value on a Nonrecurring Basis and Total Losses Resulting from those Fair Value Adjustments
The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis for the periods presented, and the total gains (losses) resulting from those fair value adjustments during the respective periods. The estimated fair value measurements are shown gross of estimated selling costs.  
 September 30, 2023Twelve Months Ended September 30, 2023
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)
Loans receivable (1)$— $— $35,627 $35,627 $(46,079)
Real estate owned (2)— — 3,857 3,857 (181)
Balance at end of period$— $— $39,484 $39,484 $(46,260)

(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, 2022Twelve Months Ended September 30, 2022
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)
Impaired loans (1)$— $— $7,912 $7,912 $(1,286)
Real estate owned (2)— — 3,128 3,128 (367)
Balance at end of period$— $— $11,040 $11,040 $(1,653)

(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, 2023September 30, 2022
  
LevelCarrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
 (In thousands)
Financial assets
Cash and cash equivalents1$980,649 $980,649 $683,965 $683,965 
Available-for-sale securities:
U.S. government and agency securities2217,053 217,053 39,354 39,354 
Asset-backed securities2588,016 588,016 767,001 767,001 
Municipal bonds234,662 34,662 34,962 34,962 
Corporate debt securities2242,522 242,522 313,757 313,757 
Mortgage-backed securities
Agency pass-through certificates2912,844 912,844 895,963 895,963 
Total available-for-sale securities1,995,097 1,995,097 2,051,037 2,051,037 
Held-to-maturity securities:
Mortgage-backed securities
Agency pass-through certificates2423,586 355,188 463,299 406,860 
Total held-to-maturity securities423,586 355,188 463,299 406,860 
Loans receivable317,476,550 16,559,758 16,113,564 15,417,635 
FHLB stock2126,820 126,820 95,073 95,073 
Other assets - client swap program hedges278,797 78,797 67,260 67,260 
Other assets - commercial loan fair value hedges23,405 3,405 2,517 2,517 
Other assets - mortgage loan fair value hedges246,396 46,396 36,765 36,765 
  Other assets - borrowings cash flow hedges2184,373 184,373 179,945 179,945 
Financial liabilities
Time deposits25,305,016 5,232,689 3,338,043 3,249,169 
Borrowings
23,650,000 3,653,229 2,125,000 1,940,813 
Other liabilities - client swap program hedges279,668 79,668 67,260 67,260