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Derivatives and Hedging Activities (Tables)

12 Months Ended

Sep. 30, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value, Notional Amount and Balance Sheet Classification

The following tables present the fair value, notional amount and balance sheet classification of derivative assets and liabilities at September 30, 2024 and September 30, 2023.

September 30, 2024			Derivative Assets												Derivative Liabilities
Interest rate contract purpose			Balance Sheet Location			Notional			Fair Value						Balance Sheet Location			Notional			Fair Value
			(In thousands)												(In thousands)
Client swap program hedges			Other assets			$	1,044,512		$	46,758					Other liabilities			$	1,044,512		$	47,388
Commercial loan fair value hedges			Other assets			37,042			1,595						Other liabilities			—			—
Mortgage loan fair value hedges			Other assets			—			—						Other liabilities			2,570,000			667
Borrowings cash flow hedges			Other assets			900,000			117,271						Other liabilities			—			—
						$	1,981,554		$	165,624								$	3,614,512		$	48,055

September 30, 2023			Derivative Assets												Derivative Liabilities
Interest rate contract purpose			Balance Sheet Location			Notional			Fair Value						Balance Sheet Location			Notional			Fair Value
			(In thousands)												(In thousands)
Client swap program hedges			Other assets			$	806,744		$	78,797					Other liabilities			$	806,744		$	79,668
Commercial loan fair value hedges			Other assets			39,661			3,405						Other liabilities			—			—
Mortgage loan fair value hedges			Other assets			670,000			46,396						Other liabilities			—			—
Borrowings cash flow hedges			Other assets			1,000,000			184,373						Other liabilities			—			—
						$	2,516,405		$	312,971								$	806,744		$	79,668

Schedule of Fair Value Hedge Accounting on Carrying Value of Hedged Items

The following tables presents the impact of fair value hedge accounting on the carrying value of the hedged items at September 30, 2024 and September 30, 2023.

(In thousands)			September 30, 2024
Balance sheet line item in which hedged item is recorded			Carrying value of hedged items			Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items
Loans receivable (1) (2)			$	7,287,540		$	20,005
			$	7,287,540		$	20,005

(1) Includes the amortized cost basis of the closed mortgage loan portfolios used to designate the hedging relationships in which the hedged items are the last layer expected to be remaining at the end of the hedging relationships. At September 30, 2024, the amortized cost basis of the closed loan portfolios used in the hedging relationships was $7,252,017,000, the cumulative basis adjustment associated with the hedging relationships was $21,476,000, and the amount of the designated hedged items was $2,570,000,000. During the year, hedge accounting was discontinued on a $300,000,000 last of layer hedge. A basis adjustment of $1,232,211 associated with the terminated portion of the hedge was deferred and is being accreted over the remaining life of the associated pool of loans.

(2) Includes the amortized cost basis of commercial loans designated in fair value hedging relationships. At September 30, 2024, the amortized cost basis of the hedged commercial loans was $35,523,000 and the cumulative basis adjustment associated with the hedging relationships was $(1,471,000).

(In thousands)			September 30, 2023
Balance sheet line item in which hedged item is recorded			Carrying value of hedged items			Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items
Loans receivable (1) (2)			$	1,816,870		$	(48,865)
			$	1,816,870		$	(48,865)

(1) Includes the amortized cost basis of the closed mortgage loan portfolios used to designate the hedging relationships in which the hedged items are the last layer expected to be remaining at the end of the hedging relationships. At September 30, 2023, the amortized cost basis of the closed loan portfolios used in the hedging relationships was $1,780,503,000, the cumulative basis adjustment associated with the hedging relationships was $(45,622,000), and the amount of the designated hedged items was $670,000,000.

(2) Includes the amortized cost basis of commercial loans designated in fair value hedging relationships. At September 30, 2023, the amortized cost basis of the hedged commercial loans was $36,367,000 and the cumulative basis adjustment associated with the hedging relationships was $(3,243,000).

Schedule of Impact of Derivative Instruments

The following table presents the impact of derivative instruments (cash flow hedges on borrowings) on AOCI for the periods presented.

(In thousands)			Twelve Months Ended September 30,
Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships			2024			2023
Interest rate contracts:
Pay fixed/receive floating swaps on cash flow hedges of borrowings			$	(67,102)		$	4,428
Total pre-tax gain/(loss) recognized in AOCI			$	(67,102)		$	4,428

The following table presents the impact of derivative instruments (client swap program) that are not designated in accounting hedges under ASC 815 for the periods presented.

(In thousands)						Twelve Months Ended September 30,
Derivative instruments			Classification of gain/(loss) recognized in income on derivative instrument			2024			2023
Interest rate contracts:
Pay fixed/receive floating swap			Other noninterest income			$	(45,960)		$	11,544
Receive fixed/pay floating swap			Other noninterest income			46,201			(12,414)
						$	241		$	(870)

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location

The following table presents the gains/(losses) on derivative instruments in fair value and cash flow accounting hedging relationships under ASC 815 for the period presented.

			Twelve Months Ended September 30, 2024						Twelve Months Ended September 30, 2023
			Interest income on loans receivable			Interest expense on FHLB advances			Interest income on loans receivable			Interest expense on FHLB advances
			(In thousands)						(In thousands)
Interest income/(expense), including the effects of fair value and cash flow hedges			$	1,165,849		$	(178,444)		$	900,068		$	(115,488)
Gain/(loss) on fair value hedging relationships:
Interest rate contracts
Amounts related to interest settlements on derivatives			$	39,223					$	16,975
Recognized on derivatives			(67,785)						10,519
Recognized on hedged items			67,639						(9,775)
Net income/(expense) recognized on fair value hedges			$	39,077					$	17,719
Gain/(loss) on cash flow hedging relationships:
Interest rate contracts
Amounts related to interest settlements on derivatives						$	46,645					$	38,709
Amount of derivative gain/(loss) reclassified from AOCI into interest income/expense						—						—
Net income/(expense) recognized on cash flow hedges						$	46,645					$	38,709

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Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

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