v3.26.1
Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2026
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, 2026
Level 1Level 2Level 3Total
(In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $190,897 $— $190,897 
Asset-backed securities— 426,124 — 426,124 
Municipal bonds— 35,276 — 35,276 
Corporate debt securities— 160,563 — 160,563 
Mortgage-backed securities
Agency pass-through certificates— 3,377,403 — 3,377,403 
Total available-for-sale securities— 4,190,263 — 4,190,263 
Client swap program hedges— 37,009 — 37,009 
Mortgage loan fair value hedges— 10,034 — 10,034 
Mortgage backed securities fair value hedges— 1,947 — 1,947 
Borrowings cash flow hedges— 104,446 — 104,446 
Total financial assets$— $4,343,699 $— $4,343,699 
Financial Liabilities
Client swap program hedges$— $37,088 $— $37,088 
Mortgage loan fair value hedges— 2,825 — 2,825 
Mortgage backed securities fair value hedges— 3,728 — 3,728 
Total financial liabilities$— $43,641 $— $43,641 
September 30, 2025
Level 1Level 2Level 3Total
(In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $235,919 $— $235,919 
Asset-backed securities— 506,334 506,334 
Municipal bonds— 35,258 — 35,258 
Corporate debt securities— 152,537 — 152,537 
Mortgage-backed securities
Agency pass-through certificates— 2,603,153 — 2,603,153 
Total available-for-sale securities— 3,533,201 — 3,533,201 
Client swap program hedges— 37,347 — 37,347 
Commercial loan fair value hedges— 1,611 — 1,611 
Mortgage loan fair value hedges— 13,082 — 13,082 
Borrowings cash flow hedges— 99,231 — 99,231 
Total financial assets$— $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 
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, 2026 and June 30, 2025, 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, 2026Three Months Ended June 30, 2026Nine Months Ended June 30, 2026
Level 1Level  2Level  3TotalTotal Gains (Losses)
(In thousands)(In thousands)
Collateral dependent loans$— $— $17,221 $17,221 $(2,226)$(7,507)
Real estate owned— — 390 390 — 69 
Balance at end of period$— $— $17,611 $17,611 $(2,226)$(7,438)


June 30, 2025Three Months Ended June 30, 2025Nine Months Ended June 30, 2025
Level 1Level  2Level  3TotalTotal Gains (Losses)
(In thousands)(In thousands)
Collateral dependent loans$— $— $32,132 $32,132 $(5,750)$(11,113)
Real estate owned— — — — — — 
Balance at end of period$— $— $32,132 $32,132 $(5,750)$(11,113)
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, 2026September 30, 2025
Level in Fair Value HierarchyCarrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
($ in thousands)
Financial assets
Cash and cash equivalents1$676,467 $676,467 $657,310 $657,310 
Available-for-sale securities
U.S. government and agency securities2190,897 190,897 235,919 235,919 
Asset-backed securities2426,124 426,124 506,334 506,334 
Municipal bonds235,276 35,276 35,258 35,258 
Corporate debt securities2160,563 160,563 152,537 152,537 
Mortgage-backed securities
Agency pass-through certificates23,377,403 3,377,403 2,603,153 2,603,153 
Total available-for-sale securities4,190,263 4,190,263 3,533,201 3,533,201 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates2858,261 821,516 645,802 612,739 
Total held-to-maturity securities858,261 821,516 645,802 612,739 
Loans receivable320,017,876 19,663,857 20,088,618 19,681,909 
FHLB stock2155,392 155,392 88,068 88,068 
        Other assets - client swap program hedges237,009 37,009 37,347 37,347 
        Other assets - commercial fair value loan hedges2— — 1,611 1,611 
        Other assets - mortgage loan fair value hedges210,034 10,034 13,082 13,082 
        Other assets - mortgage backed securities fair value
                               hedges		21,947 1,947 — — 
        Other assets - borrowings cash flow hedges2104,446 104,446 99,231 99,231 
Financial liabilities
Time deposits28,186,284 8,167,373 9,131,104 9,121,470 
Borrowings23,263,359 3,260,689 1,765,604 1,755,130 
Junior subordinated debentures352,338 52,230 51,645 50,925 
        Other liabilities - client swap program hedges237,088 37,088 37,818 37,818 
Other liabilities - mortgage loan fair value hedges22,825 2,825 20,426 20,426 
Other liabilities - mortgage backed securities fair value hedges23,728 3,728 15,086 15,086 
Reconciliation of Amortized Cost to Fair Value of Securities
The following tables provide details about the amortized cost and fair value of available-for-sale and held-to-maturity securities.


June 30, 2026
Amortized
Cost		Gross UnrealizedFair
Value		Yield
GainsLosses
($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
Within 1 year$1,129 $— $(5)$1,124 2.05 %
1 to 5 years306 — (1)305 4.25 
5 to 10 years127,047 175 (86)127,136 4.20 
Over 10 years62,237 208 (113)62,332 4.80 
Asset-backed securities
Within 1 year9,445 — (143)9,302 4.39 
Over 10 years416,906 855 (939)416,822 4.69 
Corporate debt securities due
1 to 5 years90,572 464 (5,910)85,126 4.90 
5 to 10 years79,352 — (3,915)75,437 3.94 
Municipal bonds due
1 to 5 years5,598 — (96)5,502 3.00 
5 to 10 years20,000 290 — 20,290 6.45 
Over 10 years9,698 — (214)9,484 4.59 
Mortgage-backed securities
Agency pass-through certificates3,407,456 22,301 (52,354)3,377,403 3.93 
4,229,746 24,293 (63,776)4,190,263 4.06 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates858,261 2,367 (39,112)821,516 4.22 
$5,088,007 $26,660 $(102,888)$5,011,779 4.08 %
September 30, 2025
Amortized
Cost		Gross UnrealizedFair
Value		Yield
GainsLosses
($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
Within 1 year$1,687 $— $(29)$1,658 2.05 %
1 to 5 years545 — — 545 5.00 
5 to 10 years158,026 162 (295)157,893 4.95 
Over 10 years75,887 163 (227)75,823 5.52 
Asset-backed securities
Within 1 year10,492 — (163)10,329 5.12 
5 to 10 years3,945 7 — 3,952 5.27 
Over 10 years491,734 1,702 (1,383)492,053 5.36 
Corporate debt securities due
1 to 5 years32,821 — (2,047)30,774 4.95 
5 to 10 years128,015 314 (6,566)121,763 4.37 
Municipal bonds due
5 to 10 years25,659 250 (179)25,730 5.71 
Over 10 years9,754 — (226)9,528 4.57 
Mortgage-backed securities
Agency pass-through certificates2,603,873 38,399 (39,119)2,603,153 3.83 
3,542,438 40,997 (50,234)3,533,201 4.17 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates645,802 4,073 (37,136)612,739 3.85 
$4,188,240 $45,070 $(87,370)$4,145,940 4.12 %
Schedule of Debt Securities, Available-for-Sale
The following tables show the gross unrealized losses and fair value of securities as of June 30, 2026 and September 30, 2025, by length of time that individual securities in each category have been in a continuous loss position. There were 305 and 213 securities with an unrealized loss as of June 30, 2026 and September 30, 2025, respectively.
 
June 30, 2026Less 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$(575)$29,425 $(9,250)$120,674 $(9,825)$150,099 
Municipal bonds— — (309)14,986 (309)14,986 
U.S. government and agency securities(114)14,379 (205)131,521 (319)145,900 
Asset-backed securities(420)95,145 (548)80,823 (968)175,968 
Mortgage-backed securities(16,394)1,204,316 (35,961)535,538 (52,355)1,739,854 
(17,503)1,343,265 (46,273)883,542 (63,776)2,226,807 
Held-to-maturity securities
Mortgage-backed securities(2,234)244,248 (36,878)287,361 (39,112)531,609 
$(19,737)$1,587,513 $(83,151)$1,170,903 $(102,888)$2,758,416 

September 30, 2025Less 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$(119)$19,881 $(8,495)$102,342 $(8,614)$122,223 
Municipal bonds due— — (405)15,008 (405)15,008 
U.S. government and agency securities(483)143,444 (127)35,211 (610)178,655 
Asset-backed securities(62)34,932 (1,424)135,315 (1,486)170,247 
Mortgage-backed securities(782)81,025 (38,337)653,800 (39,119)734,825 
(1,446)279,282 (48,788)941,676 (50,234)1,220,958 
Held-to-maturity securities
Mortgage-backed securities— — (37,136)310,597 (37,136)310,597 
$(1,446)$279,282 $(85,924)$1,252,273 $(87,370)$1,531,555