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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2024
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 of assets and liabilities that are measured at fair value on a recurring basis (with the exception of those measured using the NAV practical expedient).
 June 30, 2024
 Level 1Level 2Level 3Total
 (In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $292,775 $— $292,775 
Asset-backed securities— 507,812 — 507,812 
Municipal bonds— 35,017 — 35,017 
Corporate debt securities— 241,167 — 241,167 
Mortgage-backed securities
Agency pass-through certificates— 1,351,998 — 1,351,998 
Total available-for-sale securities— 2,428,769 — 2,428,769 
Loans held for sale— 468,527 — 468,527 
Derivatives:
Client swap program hedges— 63,374 — 63,374 
Commercial loan fair value hedges— 2,534 — 2,534 
Mortgage loan fair value hedges— 59,243 — 59,243 
Borrowings cash flow hedges— 151,333 — 151,333 
Total financial assets$— $3,173,780 $— $3,173,780 
Financial Liabilities
Client swap program hedges$— $64,075 $— $64,075 
Total financial liabilities$— $64,075 $— $64,075 
 September 30, 2023
 Level 1Level 2Level 3Total
 (In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $217,053 $— $217,053 
Asset-backed securities— 588,016 588,016 
Municipal bonds— 34,662 — 34,662 
Corporate debt securities— 242,522 — 242,522 
Mortgage-backed securities
Agency pass-through certificates— 912,844 — 912,844 
Total available-for-sale securities— 1,995,097 — 1,995,097 
Client swap program hedges— 78,797 — 78,797 
Commercial loan fair value hedges— 3,405 — 3,405 
Mortgage loan fair value hedges— 46,396 — 46,396 
Borrowings cash flow hedges— 184,373 — 184,373 
Total financial assets$— $2,308,068 $— $2,308,068 
Financial Liabilities
Client swap program hedges$— $79,668 $— $79,668 
Total financial liabilities$— $79,668 $— $79,668 
Schedule of Fair Value of Assets Measured on Nonrecurring Basis
The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis at June 30, 2024 and June 30, 2023, 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.
 
 June 30, 2024Three Months Ended June 30, 2024Nine Months Ended June 30, 2024
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)(In thousands)
Loans (1)$— $— $4,345 $4,345 $(2,679)$(3,004)
Real estate owned (2)— — 1,460 1,460 (35)(1,910)
Balance at end of period$— $— $5,805 $5,805 $(2,714)$(4,914)

(1)The gains (losses) represent re-measurements of collateral-dependent loans.
(2)The gains (losses) represent aggregate write-downs and charge-offs on real estate owned.
June 30, 2023Three Months Ended June 30, 2023Nine Months Ended June 30, 2023
Level 1Level  2Level  3TotalTotal Gains (Losses)
(In thousands)(In thousands)
Loans (1)$— $— $34,535 $34,535 $(10,530)$(16,773)
Real estate owned (2)— — 3,672 3,672 (121)(98)
Balance at end of period$— $— $38,207 $38,207 $(10,651)$(16,871)

(1)The gains (losses) represent re-measurements of collateral-dependent 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.
 June 30, 2024September 30, 2023
 Level in Fair Value HierarchyCarrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
 ($ in thousands)
Financial assets
Cash and cash equivalents1$2,492,504 $2,492,504 $980,649 $980,649 
Available-for-sale securities
U.S. government and agency securities2292,775 292,775 217,053 217,053 
Asset-backed securities2507,812 507,812 588,016 588,016 
Municipal bonds235,017 35,017 34,662 34,662 
Corporate debt securities2241,167 241,167 242,522 242,522 
Mortgage-backed securities
Agency pass-through certificates21,351,998 1,351,998 912,844 912,844 
Total available-for-sale securities2,428,769 2,428,769 1,995,097 1,995,097 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates2447,638 398,005 423,586 355,188 
Total held-to-maturity securities447,638 398,005 423,586 355,188 
Loans receivable320,873,919 20,038,322 17,476,550 16,559,758 
Loans held for sale2468,527 468,527 — — 
FHLB stock2107,282 107,282 126,820 126,820 
        Other assets - client swap program hedges263,374 63,374 78,797 78,797 
        Other assets - commercial fair value loan hedges22,534 2,534 3,405 3,405 
        Other assets - mortgage loan fair value hedges259,243 59,243 46,396 46,396 
        Other assets - borrowings cash flow hedges2151,333 151,333 184,373 184,373 
Financial liabilities
Time deposits29,255,760 9,188,683 5,305,016 5,232,689 
Borrowings23,934,514 3,929,935 3,650,000 3,653,229 
Junior subordinated deferrable interest debentures350,485 50,535 — — 
Senior Debt294,361 94,752 — — 
        Other liabilities - client swap program hedges264,075 64,075 79,668 79,668 
Schedule of Reconciliation of Amortized Cost to Fair Value of Available-for-Sale and Held-to-Maturity Securities
The following tables provide details about the amortized cost and fair value of available-for-sale and held-to-maturity securities.
 June 30, 2024
 Amortized
Cost		Gross UnrealizedFair
Value		Yield
 GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
Within 1 year$6,530 $3 $(4)$6,529 5.84 %
1 to 5 years5,528 3 (233)5,298 2.82 
5 to 10 years151,376 1,205 — 152,581 6.01 
Over 10 years128,092 571 (296)128,367 6.33 
Asset-backed securities
1 to 5 years12,369 — (334)12,035 6.10 
5 to 10 years17,411 63 — 17,474 6.23 
Over 10 years479,681 672 (2,050)478,303 6.33 
Corporate debt securities due
Within 1 year25,043 — (436)24,607 3.50 
1 to 5 years119,108 882 (163)119,827 5.58 
5 to 10 years112,327 — (15,594)96,733 3.87 
Municipal bonds due
5 to 10 years5,697 — (514)5,183 3.00 
Over 10 years29,803 274 (243)29,834 5.85 
Mortgage-backed securities
Agency pass-through certificates1,415,258 2,600 (65,860)1,351,998 4.01 
2,508,223 6,273 (85,727)2,428,769 4.81 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates447,638 170 (49,803)398,005 3.17 
447,638 170 (49,803)398,005 3.17 
$2,955,861 $6,443 $(135,530)$2,826,774 4.51 %
 September 30, 2023
 Amortized
Cost		Gross UnrealizedFair
Value		Yield
 GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
Within 1 year$3,501 $— $(36)$3,465 6.06 %
1 to 5 years18,894 — (563)18,331 4.70 
5 to 10 years87,922 177 — 88,099 5.76 
Over 10 years106,340 831 (13)107,158 5.84 
Asset-backed securities
1 to 5 years18,579 — (715)17,864 6.06 
5 to 10 years36,875 2 (99)36,778 6.11 
Over 10 years539,911 578 (7,115)533,374 6.35 
Corporate debt securities due
1 to 5 years151,893 895 (1,787)151,001 5.14 
5 to 10 years113,221 — (21,700)91,521 3.87 
Municipal bonds due
5 to 10 years5,720 — (701)5,019 3.00 
Over 10 years29,832 361 (550)29,643 5.85 
Mortgage-backed securities
Agency pass-through certificates1,005,928 66 (93,150)912,844 3.39 
2,118,616 2,910 (126,429)1,995,097 4.64 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates423,586 — (68,398)355,188 2.88 
423,586 — (68,398)355,188 2.88 
$2,542,202 $2,910 $(194,827)$2,350,285 4.35 %
Schedule of Debt Securities, Available-for-Sale
The following tables show the gross unrealized losses and fair value of securities as of June 30, 2024 and September 30, 2023, by length of time that individual securities in each category have been in a continuous loss position. There were 227 and 231 securities with an unrealized loss as of June 30, 2024 and September 30, 2023, respectively.
 
June 30, 2024Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value
 (In thousands)
Available-for-sale securities
Corporate debt securities$(163)$19,831 $(16,030)$121,341 $(16,193)$141,172 
Municipal bonds— — (757)14,743 (757)14,743 
Asset-backed securities(336)59,540 (2,583)299,752 (2,919)359,292 
Mortgage-backed securities(789)231,819 (65,070)696,533 (65,859)928,352 
(1,288)311,190 (84,440)1,132,369 (85,728)1,443,559 
Held-to-maturity securities
Mortgage-backed securities— — (49,802)345,952 (49,802)345,952 
$(1,288)$311,190 $(134,242)$1,478,321 $(135,530)$1,789,511 

September 30, 2023Less than 12 months12 months or moreTotal
 Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value		Unrealized
Gross Losses		Fair
Value
 (In thousands)
Available-for-sale securities
Corporate debt securities$— $— $(23,487)$167,452 $(23,487)$167,452 
Municipal bonds due— — (1,250)14,302 (1,250)14,302 
U.S. government and agency securities(13)14,917 (599)21,795 (612)36,712 
Asset-backed securities(2,142)86,800 (5,788)445,454 (7,930)532,254 
Mortgage-backed securities(2,030)142,235 (91,120)744,010 (93,150)886,245 
(4,185)243,952 (122,244)1,393,013 (126,429)1,636,965 
Held-to-maturity securities
Mortgage-backed securities(15)1,424 (68,383)353,764 (68,398)355,188 
$(4,200)$245,376 $(190,627)$1,746,777 $(194,827)$1,992,153