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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative, Notional Amount $ 2,764,805 $ 1,254,905
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 21,675 23,246
Derivative Liability, Notional Amount 1,645,000 420,000
Derivative Liability, Fair Value, Gross Liability (3,080) (4,638)
Gain (loss) on derivatives, net (13,339) 35,270
Forward Sales Of Reverse Loans    
Derivative [Line Items]    
Derivative, Notional Amount 175,000 30,000
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 364 34
Derivative Liability, Notional Amount 0 20,000
Derivative Liability, Fair Value, Gross Liability 0 (84)
Gain (loss) on derivatives, net 414 (29)
Forward loans IRLCs    
Derivative [Line Items]    
Derivative, Notional Amount 1,021,978 619,713
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 16,074 22,224
Gain (loss) on derivatives, net (6,150) 17,479
TBA Forward Pipelines Trades    
Derivative [Line Items]    
Derivative, Notional Amount 587,000 0
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 946 0
Derivative Liability, Notional Amount 645,000 0
Derivative Liability, Fair Value, Gross Liability 898 0
Gain (loss) on derivatives, net 1,483 0
Interest Rate Swap    
Derivative [Line Items]    
Derivative, Notional Amount 792,500 593,500
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 1,734 504
Gain (loss) on derivatives, net 0 (10,140)
Option Contracts    
Derivative [Line Items]    
Derivative, Notional Amount 125,000 0
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 547 0
Derivative Liability, Notional Amount 450,000 0
Derivative Liability, Fair Value, Gross Liability 824 0
TBA forward MBS trades    
Fair value of derivative assets (liabilities) at:    
Derivative Liability, Notional Amount 550,000 400,000
Derivative Liability, Fair Value, Gross Liability (287) (4,554)
Interest Rate Swap Futures And TBA Forward MBS Trades    
Fair value of derivative assets (liabilities) at:    
Gain (loss) on derivatives, net (9,542) 27,538
Others    
Derivative [Line Items]    
Derivative, Notional Amount 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, Gross Liability (1,070) 0
Gain (loss) on derivatives, net (2) 73
Other    
Fair value of derivative assets (liabilities) at:    
Gain (loss) on derivatives, net (1,070) 0
Reverse Loans IRLCs    
Derivative [Line Items]    
Derivative, Notional Amount 63,327 11,692
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 2,011 482
Gain (loss) on derivatives, net $ 1,529 $ 349