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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative, Notional Amount $ 1,254,905 $ 1,472,566
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 23,246 6,007
Derivative Liability, Notional Amount 420,000 47,083
Derivative Liability, Fair Value, Gross Liability (4,638) (100)
Gain (loss) on derivatives, net 35,270 (1,132)
Forward Sales Of Reverse Loans    
Derivative [Line Items]    
Derivative, Notional Amount 30,000 40,000
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 34 8
Derivative Liability, Notional Amount 20,000 20,000
Derivative Liability, Fair Value, Gross Liability (84) (29)
Gain (loss) on derivatives, net (29) 91
Forward loans IRLCs    
Derivative [Line Items]    
Derivative, Notional Amount 619,713 204,020
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 22,224 4,745
Gain (loss) on derivatives, net 17,479 756
TBA forward MBS trades    
Derivative [Line Items]    
Derivative, Notional Amount 0 1,200,000
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 0 1,121
Derivative Liability, Notional Amount 400,000 0
Derivative Liability, Fair Value, Gross Liability (4,554) 0
Forward LHFS Trades    
Fair value of derivative assets (liabilities) at:    
Gain (loss) on derivatives, net 0 (3,833)
Interest Rate Swap    
Derivative [Line Items]    
Derivative, Notional Amount 593,500 0
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 504 0
Gain (loss) on derivatives, net (10,140) 471
Interest Rate Swap Futures And TBA Forward MBS Trades    
Fair value of derivative assets (liabilities) at:    
Gain (loss) on derivatives, net 27,538 525
Interest Rate Caps    
Fair value of derivative assets (liabilities) at:    
Derivative Liability, Notional Amount 0 27,083
Derivative Liability, Fair Value, Gross Liability 0 0
Gain (loss) on derivatives, net 0 (358)
Derivative    
Derivative [Line Items]    
Derivative, Notional Amount 0 0
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 2 0
Derivative Liability, Notional Amount 0 0
Derivative Liability, Fair Value, Gross Liability 0 (71)
Gain (loss) on derivatives, net 73 673
Reverse Mortgage Loan Interest Rate Lock Commitments    
Derivative [Line Items]    
Derivative, Notional Amount 11,692 28,546
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 482 133
Gain (loss) on derivatives, net $ 349 $ 543