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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Derivative [Line Items]
Notional balance	$ 1,781,414		$ 1,781,414		$ 2,764,805
Derivatives, at fair value	13,688		13,688		21,675
Derivative liability, notional amount	1,564,087		1,564,087		1,645,000
Derivative liability, fair value	(9,646)		(9,646)		(3,080)
Gains (losses) on derivatives	13,302	$ 25,846	(18,729)	$ 4,030
Forward Sales Of Reverse Loans
Derivative [Line Items]
Notional balance	93,000		93,000		175,000
Derivatives, at fair value	565		565		364
Gains (losses) on derivatives	557	199	202	197
Forward loans IRLCs
Derivative [Line Items]
Notional balance	526,212		526,212		1,021,978
Derivatives, at fair value	4,620		4,620		16,074
Gains (losses) on derivatives	604	3,528	(11,454)	(5,074)
Reverse loans IRLCs
Derivative [Line Items]
Notional balance	31,202		31,202		63,327
Derivatives, at fair value	1,126		1,126		2,011
Gains (losses) on derivatives	(817)	(671)	(1,171)	(186)
TBA forward MBS trades
Derivative [Line Items]
Notional balance	356,000		356,000		587,000
Derivatives, at fair value	3,566		3,566		946
Derivative liability, notional amount	827,000		827,000		1,195,000
Derivative liability, fair value	(7,623)		(7,623)		(1,185)
Interest Rate Swap
Derivative [Line Items]
Notional balance	250,000		250,000		792,500
Derivatives, at fair value	742		742		1,734
Interest rate option contracts
Derivative [Line Items]
Notional balance	525,000		525,000		125,000
Derivatives, at fair value	3,069		3,069		547
Derivative liability, notional amount	725,000		725,000		450,000
Derivative liability, fair value	(1,890)		(1,890)		(824)
Reverse loan IRLCs - EquityIQ loans
Derivative [Line Items]
Gains (losses) on derivatives	286	0	286	0
TBA Forward Pipelines Trades
Derivative [Line Items]
Gains (losses) on derivatives	29,118	(188)	76,224	(188)
TBA Trades
Derivative [Line Items]
Gains (losses) on derivatives	(78)	0	(78)	0
Interest Rate Swap Futures And TBA Forward MBS Trades
Derivative [Line Items]
Gains (losses) on derivatives	(16,913)	22,979	(83,676)	9,297
Other
Derivative [Line Items]
Derivative liability, notional amount	12,087		12,087		0
Derivative liability, fair value	(133)		(133)		$ (1,070)
Gains (losses) on derivatives	0	0	0	(16)
Other Derivatives
Derivative [Line Items]
Gains (losses) on derivatives	$ 544	$ 0	$ 937	$ 0