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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

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

X

- 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
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-Paragraph 2
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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

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Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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-Name Accounting Standards Codification
-Section 55
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