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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative Notional Balance
Notional balance	$ 2,597,937		$ 1,254,905
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	20,329		23,246
Derivative liability, notional amount	2,462,500		420,000
Derivative liability, fair value	(20,518)		(4,638)
Gains (losses) on derivatives	(11,362)	$ 46,871
Forward loans IRLCs
Derivative Notional Balance
Notional balance	1,222,451		619,713
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	13,407		22,224
Gains (losses) on derivatives	(8,817)	16,860
Reverse loans IRLCs
Derivative Notional Balance
Notional balance	80,486		11,692
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	623		482
Gains (losses) on derivatives	141	940
TBA Forward Pipelines Trades
Derivative Notional Balance
Notional balance	1,210,000		0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	5,538		0
Derivative liability, notional amount	245,000		0
Derivative liability, fair value	(276)
Gains (losses) on derivatives	592	0
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	952,500		0
Derivative liability, fair value	(8,236)		0
Gains (losses) on derivatives	0	(9,564)
Interest Rate Swap Futures And TBA Forward MBS Trades
Fair value of derivative assets (liabilities) at:
Gains (losses) on derivatives	(3,310)	39,258
Forward Sales Of Reverse Loans
Derivative Notional Balance
Notional balance	85,000		30,000
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	762		34
Derivative liability, notional amount	55,000		20,000
Derivative liability, fair value	(341)		(84)
Gains (losses) on derivatives	471	(62)
TBA forward MBS trades
Fair value of derivative assets (liabilities) at:
Derivative liability, notional amount	1,210,000		400,000
Derivative liability, fair value	(11,227)		(4,554)
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	(438)		$ 0
Gains (losses) on derivatives	$ (439)	$ (561)

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