Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative Notional Balance
Notional balance	$ 1,627,127		$ 1,254,905
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	15,483		23,246
Derivative liability, notional amount	1,445,000		420,000
Derivative liability, fair value	(10,012)		(4,638)
Gains (losses) on derivatives	(21,816)	$ 33,555
Forward Sales Of Reverse Loans
Derivative Notional Balance
Notional balance	70,000		30,000
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	100		34
Derivative liability, notional amount	35,000		20,000
Derivative liability, fair value	(152)		(84)
Gains (losses) on derivatives	(2)	(143)
Forward loans IRLCs
Derivative Notional Balance
Notional balance	916,930		619,713
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	13,622		22,224
Gains (losses) on derivatives	(8,602)	5,714
Reverse loans IRLCs
Derivative Notional Balance
Notional balance	50,197		11,692
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	967		482
Gains (losses) on derivatives	485	(115)
TBA forward MBS trades
Derivative Notional Balance
Notional balance	590,000		0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	794		0
Derivative liability, notional amount	10,000		400,000
Derivative liability, fair value	(314)		(4,554)
Interest Rate Swap
Derivative Notional Balance
Notional balance	0		593,500
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0		504
Derivative liability, notional amount	1,400,000		0
Derivative liability, fair value	(9,532)		0
Gains (losses) on derivatives	0	(7,192)
Interest Rate Swap Futures And TBA Forward MBS Trades
Fair value of derivative assets (liabilities) at:
Gains (losses) on derivatives	(13,682)	35,291
Other
Derivative Notional Balance
Notional balance	0		0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0		2
Derivative liability, notional amount	0		0
Derivative liability, fair value	(14)		$ 0
Gains (losses) on derivatives	$ (16)	$ 0

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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