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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional amount	$ 3,273,707		$ 3,273,707			$ 1,772,298
Accumulated other comprehensive loss	1,105,799	$ 1,154,242	1,105,799	$ 1,154,242	$ 1,124,138	1,083,985	$ 1,258,091	$ 1,386,087
Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive loss	(69,216)	(73,343)	(69,216)	(73,343)	$ (70,256)	(72,303)	$ (74,383)	$ (76,430)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive loss	(69,000)		(69,000)			(72,000)
Interest Expense | Cash Flow Hedging
Derivative [Line Items]
Expected amortization of realized losses related to terminated cash flow hedges			4,000
Loan purchase commitments and forward sales commitments
Derivative [Line Items]
Market valuations gains (losses), net	6,000	(3,000)	8,000	(54,000)
Interest Rate Swap And Swaptions
Derivative [Line Items]
Notional amount	190,000		190,000
TBAs
Derivative [Line Items]
Notional amount	2,000,000		2,000,000			1,070,000
Interest rate futures
Derivative [Line Items]
Notional amount	204,000		204,000			411,000
Interest rate contract
Derivative [Line Items]
Notional amount						$ 285,000
Interest rate contract | Cash Flow Hedging
Derivative [Line Items]
Realized net losses from accumulated comprehensive loss into Interest expense	(1,000)	(3,000)	(1,000)	(3,000)
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gains	$ 23,000	$ 76,000	$ 18,000	$ 198,000

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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