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Derivative Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional amount	$ 9,842,443,000		$ 6,861,921,000
Accumulated other comprehensive income (loss)	1,445,266,000	$ 1,215,575,000	1,386,087,000	$ 1,110,899,000
Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)	(75,412,000)	(79,539,000)	(76,430,000)	$ (80,557,000)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)	(75,000,000)		(76,000,000)
Interest Expense | Cash Flow Hedging
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified over the next 12 months	(4,000,000)
Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	1,293,000	75,562,000
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	(42,000,000)	(52,000,000)
Interest Rate Swap And Swaptions
Derivative [Line Items]
Notional amount	526,000,000
TBAs
Derivative [Line Items]
Notional amount	7,940,000,000		3,310,000,000
Interest rate futures
Derivative [Line Items]
Notional amount	281,000,000		72,000,000
Interest rate contract
Derivative [Line Items]
Notional amount	381,000,000		$ 2,100,000,000
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gain (loss)	$ 92,000,000	$ 93,000,000

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Increase (Decrease) in Fair Value Adjustments on Assets

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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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Nominal or face amount used to calculate payment on derivative.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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