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Fair Value Measurements
 6 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
FASB ASC 820, Fair Value Measurement ("ASC 820") defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active exchange markets that the entity has the ability to access as of the measurement date.
Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active and other inputs that are observable or can be corroborated by observable market data.
Level 3: Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

The Company has established and documented the process for determining the fair values of its assets and liabilities, where applicable. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, fair value is determined using valuation models or third-party appraisals. The following is a description of the valuation methodologies used to measure and report the fair value of financial assets and liabilities on a recurring or nonrecurring basis.
Measured on a Recurring Basis

Available-for-Sale Investment Securities and Derivative Contracts
Securities available for sale are recorded at fair value on a recurring basis. The fair value of debt securities are priced using model pricing based on the securities' relationship to other benchmark quoted prices as provided by an independent third party, and under GAAP are considered a Level 2 input method. Securities that are traded on active exchanges are measured using the closing price in an active market and are considered a Level 1 input method.
The Company offers interest rate swaps to its variable rate borrowers who want to manage their interest rate risk. At the same time, the Company enters into the opposite trade with a counter party to offset its interest rate risk. The Company has also entered into commercial loan hedges, mortgage pool hedges and borrowings hedges using interest rate swaps. The fair value of these interest rate swaps are estimated by a third-party pricing service using a discounted cash flow technique. These are considered a Level 2 input method.
 
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).
 March 31, 2025
 Level 1Level 2Level 3Total
 (In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $273,755 $— $273,755 
Asset-backed securities— 533,677 — 533,677 
Municipal bonds— 35,349 — 35,349 
Corporate debt securities— 225,310 — 225,310 
Mortgage-backed securities
Agency pass-through certificates— 2,074,672 — 2,074,672 
Total available-for-sale securities— 3,142,763 — 3,142,763 
Client swap program hedges— 47,257 — 47,257 
Commercial loan fair value hedges— 1,989 — 1,989 
Mortgage loan fair value hedges— 6,876 — 6,876 
Borrowings cash flow hedges— 120,666 — 120,666 
Total financial assets$— $3,319,551 $— $3,319,551 
Financial Liabilities
Client swap program hedges$— $47,816 $— $47,816 
Mortgage backed securities fair value hedges— 8,682 — 8,682 
Total financial liabilities$— $56,498 $— $56,498 
 September 30, 2024
 Level 1Level 2Level 3Total
 (In thousands)
Financial Assets
Available-for-sale securities:
U.S. government and agency securities$— $314,204 $— $314,204 
Asset-backed securities— 540,125 540,125 
Municipal bonds— 35,073 — 35,073 
Corporate debt securities— 296,282 — 296,282 
Mortgage-backed securities
Agency pass-through certificates— 1,387,025 — 1,387,025 
Total available-for-sale securities— 2,572,709 — 2,572,709 
Client swap program hedges— 46,758 — 46,758 
Commercial loan fair value hedges— 1,595 — 1,595 
Mortgage loan fair value hedges— — — — 
Borrowings cash flow hedges— 117,271 — 117,271 
Total financial assets$— $2,738,333 $— $2,738,333 
Financial Liabilities
Client swap program hedges$— $47,388 $— $47,388 
Mortgage loan fair value hedges667 667 
Total financial liabilities$— $48,055 $— $48,055 
Measured on a Nonrecurring Basis

Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as collateral dependent loans and real estate owned ("REO"). REO consists principally of properties acquired through foreclosure and branch properties no longer in use. From time to time, and on a nonrecurring basis, adjustments using fair value measurements are recorded to reflect increases or decreases based on the discounted cash flows, the current appraisal or estimated value of the collateral or REO property.

When management determines that the fair value of the collateral or the REO requires additional adjustments, either as a result of an updated appraised value or when there is no observable market price, the Company classifies the collateral dependent loan or real estate owned as Level 3. Level 3 assets recorded at fair value on a nonrecurring basis at March 31, 2025 included loans for which an allowance was established or a partial charge-off was recorded based on the fair value of collateral, as well as real estate owned where the fair value of the property was less than the cost basis.

The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis at March 31, 2025 and March 31, 2024, 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.
 
 March 31, 2025Three Months Ended March 31, 2025Six Months Ended March 31, 2025
 Level 1Level  2Level  3TotalTotal Gains (Losses)
 (In thousands)(In thousands)
Loans1
$— $— $9,338 $9,338 $(5,092)$(5,363)
Real estate owned— — — — — — 
Balance at end of period$— $— $9,338 $9,338 $(5,092)$(5,363)
1The gains (losses) represent re-measurements of collateral-dependent loans.

March 31, 2024Three Months Ended March 31, 2024Six Months Ended March 31, 2024
Level 1Level  2Level  3TotalTotal Gains (Losses)
(In thousands)(In thousands)
Loans1
$— $— $781 $781 $(168)$(325)
Real estate owned— — 1,360 1,360 (1,875)(1,875)
Balance at end of period$— $— $2,141 $2,141 $(2,043)$(2,200)
1The gains (losses) represent re-measurements of collateral-dependent loans.

At March 31, 2025, there were no foreclosed residential real estate properties held as REO. The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $2,020,000.
Fair Values of Financial Instruments
FASB ASC 825, Financial Instruments ("ASC 825") requires disclosure of fair value information about financial instruments, whether or not recognized on the statement of financial condition, for which it is practicable to estimate those values. Certain financial instruments and all non-financial instruments are excluded from the disclosure requirements. Accordingly, the aggregate fair value estimates presented do not reflect the underlying fair value of the Company. Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below.
 March 31, 2025September 30, 2024
 Level in Fair Value HierarchyCarrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
 ($ in thousands)
Financial assets
Cash and cash equivalents1$1,231,461 $1,231,461 $2,381,102 $2,381,102 
Available-for-sale securities
U.S. government and agency securities2273,755 273,755 314,204 314,204 
Asset-backed securities2533,677 533,677 540,125 540,125 
Municipal bonds235,349 35,349 35,073 35,073 
Corporate debt securities2225,310 225,310 296,282 296,282 
Mortgage-backed securities
Agency pass-through certificates22,074,672 2,074,672 1,387,025 1,387,025 
Total available-for-sale securities3,142,763 3,142,763 2,572,709 2,572,709 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates2526,502 484,592 436,972 401,046 
Total held-to-maturity securities526,502 484,592 436,972 401,046 
Loans receivable320,920,001 20,250,350 20,916,354 20,269,059 
FHLB stock2133,964 133,964 95,617 95,617 
        Other assets - client swap program hedges247,257 47,257 46,758 46,758 
        Other assets - commercial fair value loan hedges21,989 1,989 1,595 1,595 
        Other assets - mortgage loan fair value hedges26,876 6,876 — — 
        Other assets - borrowings cash flow hedges2120,666 120,666 117,271 117,271 
Financial liabilities
Time deposits29,573,442 9,558,092 9,556,785 9,787,187 
Borrowings22,763,758 2,763,048 3,267,589 3,276,122 
Junior subordinated debentures351,180 51,167 50,718 50,240 
        Other liabilities - client swap program hedges247,816 47,816 47,388 47,388 
Other liabilities - mortgage loan fair value hedges2— — 667 667 
Other liabilities - mortgage backed securities fair value hedges28,682 8,682 — — 

The following methods and assumptions were used to estimate the fair value of financial instruments:
Cash and cash equivalents – The carrying amount of these items is a reasonable estimate of their fair value. 
Available-for-sale securities and held-to-maturity securities – Securities at fair value are primarily priced using model pricing based on the securities' relationship to other benchmark quoted prices as provided by an independent third party, and are considered a Level 2 input method. Equity securities that are exchange traded are considered a Level 1 input method.
Loans receivable – Fair values are estimated first by stratifying the portfolios of loans with similar financial characteristics. Loans are segregated by type such as multi-family real estate, residential mortgage, construction, commercial, consumer and land loans. Each loan category is further segmented into fixed- and adjustable-rate interest terms. For residential mortgages and multi-family loans, the bank determined that its best exit price was by securitization. MBS benchmark prices are used as a base price, with further loan level pricing adjustments made based on individual loan characteristics such as FICO score, LTV,
Property Type and occupancy. For all other loan categories an estimate of fair value is then calculated based on discounted cash flows using a discount rate offered and observed in the market on similar products, plus an adjustment for liquidity to reflect the non-homogeneous nature of the loans, as well as an annual loss rate based on historical losses to arrive at an estimated exit price fair value. Fair value for impaired loans is also based on recent appraisals or estimated cash flows discounted using rates commensurate with risk associated with the estimated cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information.
FHLB stock – The fair value is based upon the par value of the stock that equates to its carrying value.
Time deposits – The fair value of time deposits is estimated by discounting the estimated future cash flows using rates offered for deposits with similar remaining maturities.
Borrowings – The fair value of FHLB advances and FRB borrowings is estimated by discounting the estimated future cash flows using rates currently available to the Company for debt with similar remaining maturities.
Junior subordinated deferrable interest debentures - The fair value of junior subordinated debentures is estimated using an income approach valuation technique. The significant unobservable input utilized in the estimation of fair value of these instruments is the credit risk adjusted spread. The credit risk adjusted spread represents the nonperformance risk of the liability, contemplating the inherent risk of the obligation. The ending carrying (fair) value of the junior subordinated debentures measured at fair value represents the estimated amount that would be paid to transfer these liabilities in an orderly transaction amongst market participants. Due to credit concerns in the capital markets and inactivity in the trust preferred markets that have limited the observability of market spreads, the Company has classified this as a Level 3 fair value measurement.
Interest rate swaps – The Company offers interest rate swaps to its variable rate borrowers who want to manage their interest rate risk. At the same time, the Company enters into the opposite trade with a counterparty to offset its interest rate risk. The Company also uses interest rate swaps for various fair value hedges and cash flow hedges. The fair value of these interest rate swaps is estimated by a third-party pricing service using a discounted cash flow technique.
The following tables provide details about the amortized cost and fair value of available-for-sale and held-to-maturity securities.


 March 31, 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 to 5 years3,822 1 (88)3,735 2.65 
5 to 10 years184,822 869 (1)185,690 4.96 
Over 10 years84,358 432 (460)84,330 5.48 
Asset-backed securities
1 to 5 years10,898 — (385)10,513 5.10 
5 to 10 years6,703 — — 6,703 5.25 
Over 10 years517,134 1,243 (1,916)516,461 5.31 
Corporate debt securities due
Within 1 year44,998 8 (16)44,990 4.61 
1 to 5 years30,482 137 — 30,619 5.75 
5 to 10 years161,433 315 (12,047)149,701 4.57 
Municipal bonds due
5 to 10 years5,674 — (451)5,223 3.00 
Over 10 years29,774 570 (218)30,126 5.85 
Mortgage-backed securities
Agency pass-through certificates2,107,148 17,189 (49,665)2,074,672 3.69 
3,187,246 20,764 (65,247)3,142,763 4.18 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates526,502 982 (42,892)484,592 3.58 
526,502 982 (42,892)484,592 3.58 
$3,713,748 $21,746 $(108,139)$3,627,355 4.02 %
 September 30, 2024
 Amortized
Cost		Gross UnrealizedFair
Value		Yield
 GainsLosses
 ($ in thousands)
Available-for-sale securities
U.S. government and agency securities due
Within 1 year$4,360 $4 $— $4,364 5.58 %
1 to 5 years4,640 2 (124)4,518 2.82 
5 to 10 years166,070 1,230 — 167,300 5.97 
Over 10 years137,799 394 (171)138,022 6.29 
Asset-backed securities
1 to 5 years11,466 — (284)11,182 6.04 
5 to 10 years9,631 — (3)9,628 6.20 
Over 10 years520,756 600 (2,041)519,315 6.15 
Corporate debt securities due
Within 1 year45,024 — (367)44,657 4.61 
1 to 5 years99,244 977 — 100,221 5.39 
5 to 10 years112,029 — (10,625)101,404 3.87 
Over 10 years50,000 — — 50,000 6.85 
Municipal bonds due
5 to 10 years5,689 — (243)5,446 3.00 
Over 10 years29,793 — (166)29,627 5.85 
Mortgage-backed securities
Agency pass-through certificates1,420,376 7,324 (40,675)1,387,025 4.09 
2,616,877 10,531 (54,699)2,572,709 4.87 
Held-to-maturity securities
Mortgage-backed securities
Agency pass-through certificates436,972 913 (36,839)401,046 3.18 
436,972 913 (36,839)401,046 3.18 
$3,053,849 $11,444 $(91,538)$2,973,755 4.63 %


The Company purchased $809,552,000 of AFS investment securities during the six months ended March 31, 2025 and purchased $214,707,000 of AFS securities during the six months ended March 31, 2024. Sales of AFS securities totaled $797,000 during the six months ended March 31, 2025 compared to $176,402,000 during the prior year's same period. The Company sold approximately $171,000,000 of AFS securities obtained in the Merger during the six months ended March 31, 2024 to rebalance the overall portfolio. Realized gains and losses from the sales were included in purchase accounting adjustments to reflect the acquisition date fair value as they took place close to the Merger date.

For HTM investment securities, there were $114,182,000 in purchases during the six months ended March 31, 2025 and $47,670,000 in purchases during the six months ended March 31, 2024. There were no sales of HTM investment securities during the six months ended March 31, 2025 or March 31, 2024. Substantially all of the agency mortgage-backed securities have contractual due dates that exceed 25 years.

The Company elected to exclude AIR from the amortized cost basis of debt securities disclosed throughout this footnote. For AFS securities, AIR totaled $9,995,000 and $9,311,000 as of March 31, 2025 and September 30, 2024, respectively. For HTM debt securities, AIR totaled $1,571,000 and $1,154,000 as of March 31, 2025 and September 30, 2024, respectively. AIR for
securities is included in the Interest receivable line item balance on the Company’s consolidated statements of financial condition.
The following tables show the gross unrealized losses and fair value of securities as of March 31, 2025 and September 30, 2024, by length of time that individual securities in each category have been in a continuous loss position. There were 205 and 209 securities with an unrealized loss as of March 31, 2025 and September 30, 2024, respectively.
 
March 31, 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$(229)$19,771 $(11,834)$119,597 $(12,063)$139,368 
Municipal bonds— — (669)14,779 (669)14,779 
U.S. government and agency securities— — — — — — 
Asset-backed securities(694)87,482 (2,156)196,342 (2,850)283,824 
Mortgage-backed securities(663)146,416 (49,002)621,574 (49,665)767,990 
(1,586)253,669 (63,661)952,292 (65,247)1,205,961 
Held-to-maturity securities
Mortgage-backed securities(9)34,152 (42,883)324,360 (42,892)358,512 
$(1,595)$287,821 $(106,544)$1,276,652 $(108,139)$1,564,473 

September 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$— $— $(10,993)$146,060 $(10,993)$146,060 
Municipal bonds due(15)19,985 (394)15,088 (409)35,073 
U.S. government and agency securities— — — — — — 
Asset-backed securities(249)116,173 (2,373)235,846 (2,622)352,019 
Mortgage-backed securities(165)103,283 (40,510)728,968 (40,675)832,251 
(429)239,441 (54,270)1,125,962 (54,699)1,365,403 
Held-to-maturity securities
Mortgage-backed securities— — (36,839)348,573 (36,839)348,573 
$(429)$239,441 $(91,109)$1,474,535 $(91,538)$1,713,976 

Substantially all of the Company’s HTM debt securities are issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government and have a long history of zero credit loss. Therefore, the Company did not record an allowance for credit losses for these securities as of March 31, 2025 or September 30, 2024. The Company does not consider HTM investments to have any credit impairment.

The Company does not believe that the AFS debt securities that were in an unrealized loss position have any credit loss impairment as of March 31, 2025 or September 30, 2024. The Company does not intend to sell the investment securities that were in an unrealized loss position and it is more likely than not that the Company will not be required to sell the investment securities before recovery of their amortized cost basis, which may be at maturity. AFS debt securities issued by U.S.
government agencies or U.S. government-sponsored enterprises carry the explicit and/or implicit guarantee of the U.S. government and have a long history of zero credit loss. Corporate debt securities and municipal bonds are considered to have an issuer of high credit quality and the decline in fair value is due to changes in interest rates and other market conditions. The issuer continues to make timely principal and interest payments on the bonds. The fair value is expected to recover as the bonds approach maturity.