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Derivative Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional amount	$ 6,499,482,000			$ 6,499,482,000			$ 11,346,407,000
Accumulated other comprehensive income (loss)	1,295,142,000	$ 936,576,000	$ 725,202,000	1,295,142,000	$ 936,576,000	$ 1,215,575,000	1,110,899,000	$ 1,827,231,000
Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)	(78,511,000)	(82,637,000)	(83,666,000)	(78,511,000)	(82,637,000)	$ (79,539,000)	(80,557,000)	$ (50,939,000)
Interest Expense
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	45,759,000	(1,443,000)		121,321,000	(38,446,000)
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	53,000,000	1,000,000		300,000	22,000,000
Interest rate contract
Derivative [Line Items]
Notional amount	2,320,000,000			2,320,000,000			1,630,000,000
TBAs
Derivative [Line Items]
Notional amount	1,460,000,000			1,460,000,000			$ 6,630,000,000
Interest rate futures
Derivative [Line Items]
Notional amount	222,000,000			222,000,000
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gain (loss)	(58,000,000)	0		35,000,000	(98,000,000)
Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative gain (loss)	$ 0	$ 0		$ 0	$ (33,000,000)
Derivative, cost of hedge			$ 84,000,000

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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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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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