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Fair Value Measurements (Tables)

12 Months Ended

Sep. 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 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, 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 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

			September 30, 2023
			Level 1						Level 2						Level 3						Total
			(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 fair value hedges			—						3,405						—						3,405
Mortgage loan fair value hedge			—						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 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, 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.

			September 30, 2023																														Twelve Months Ended September 30, 2023
			Level 1						Level  2						Level  3						Total												Total 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.

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, 2024									September 30, 2023
			Level			Carrying Amount			Estimated Fair Value						Carrying Amount			Estimated Fair Value
						(In thousands)
Financial assets
Cash and cash equivalents			1			$	2,381,102		$	2,381,102					$	980,649		$	980,649
Available-for-sale securities:
U.S. government and agency securities			2			314,204			314,204						217,053			217,053
Asset-backed securities			2			540,125			540,125						588,016			588,016
Municipal bonds			2			35,073			35,073						34,662			34,662
Corporate debt securities			2			296,282			296,282						242,522			242,522
Mortgage-backed securities
Agency pass-through certificates			2			1,387,025			1,387,025						912,844			912,844
Total available-for-sale securities						2,572,709			2,572,709						1,995,097			1,995,097
Held-to-maturity securities:
Mortgage-backed securities
Agency pass-through certificates			2			436,972			401,046						423,586			355,188
Total held-to-maturity securities						436,972			401,046						423,586			355,188
Loans receivable			3			20,916,354			20,269,059						17,476,550			16,559,758
FHLB stock			2			95,617			95,617						126,820			126,820
Other assets - client swap program hedges			2			46,758			46,758						78,797			78,797
Other assets - commercial loan fair value hedges			2			1,595			1,595						3,405			3,405
Other assets - mortgage loan fair value hedges			2			—			—						46,396			46,396
Other assets - borrowings cash flow hedges			2			117,271			117,271						184,373			184,373
Financial liabilities
Time deposits			2			9,556,785			9,787,187						5,305,016			5,232,689
Borrowings			2			3,267,589			3,276,122						3,650,000			3,653,229
Junior subordinated deferrable interest debentures			3			50,718			50,240						—			—
Other liabilities - client swap program hedges			2			47,388			47,388						79,668			79,668
Other liabilities - mortgage loan fair value hedges			2			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
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Definition

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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

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