Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Narrative (Details)

v3.25.0.1
Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]        
Total available-for-sale securities $ 7,371,711,000 $ 8,327,149,000    
Mortgage servicing rights, at fair value 2,994,271,000 $ 3,052,016,000 $ 2,984,937,000 $ 2,191,578,000
Weighted average remaining maturities   6 months    
Derivative assets, at fair value 10,114,000 $ 85,291,000    
Derivative liabilities, at fair value (24,897,000) (21,506,000)    
Interest-Only-Strip        
Derivative Instruments, Gain (Loss) [Line Items]        
Total available-for-sale securities 16,500,000 41,900,000    
Interest Rate Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Net interest expense (income) on interest rate swaps and caps (58,500,000) (21,400,000) 4,800,000  
Interest rate lock commitments        
Derivative Instruments, Gain (Loss) [Line Items]        
Average notional amount 25,879,000      
Amount outstanding 18,340,000 0    
Fair Value $ 100,000      
Interest rate lock commitments | Minimum        
Derivative Instruments, Gain (Loss) [Line Items]        
Funding or cancellation or expiration of lock commitment 30 days      
Interest rate lock commitments | Maximum        
Derivative Instruments, Gain (Loss) [Line Items]        
Funding or cancellation or expiration of lock commitment 90 days      
Forward mortgage loan sale commitments        
Derivative Instruments, Gain (Loss) [Line Items]        
Average notional amount $ 25,900,000      
Amount outstanding 20,373,000 0    
Fair Value 200,000      
TBAs, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Average notional amount (13,025,485,000) (1,923,988,000)    
Amount outstanding 17,292,890,000 15,045,799,000    
TBAs, net | Interest Rate Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Average notional amount $ 14,100,000,000 $ 8,000,000,000.0 $ 12,400,000,000