Quarterly report [Sections 13 or 15(d)]

Derivative Instruments and Hedging Activities - Narrative (Details)

v3.25.3
Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]                
Average notional amount $ 24,291,340,000 $ 13,389,167,000 $ 17,135,722,000 $ 11,503,991,000        
Total available-for-sale securities 6,348,157,000   6,348,157,000     $ 7,371,711,000    
Mortgage servicing rights, at fair value 2,626,706,000 2,884,304,000 2,626,706,000 2,884,304,000 $ 3,015,643,000 2,994,271,000 $ 3,065,415,000 $ 3,052,016,000
Derivative assets, at fair value 135,431,000   135,431,000     10,114,000    
Derivative liabilities, at fair value 7,720,000   $ 7,720,000     24,897,000    
Warehouse lines of credit                
Derivative Instruments, Gain (Loss) [Line Items]                
Weighted average remaining maturities     60 days          
Interest-Only-Strip                
Derivative Instruments, Gain (Loss) [Line Items]                
Total available-for-sale securities 16,000,000.0   $ 16,000,000.0     16,500,000    
Interest Rate Contract                
Derivative Instruments, Gain (Loss) [Line Items]                
Net interest income on interest rate swaps 8,100,000 17,100,000 20,500,000 46,400,000        
Average notional amount 22,000,000,000.0 13,400,000,000 16,500,000,000 13,300,000,000        
Interest rate lock commitments                
Derivative Instruments, Gain (Loss) [Line Items]                
Average notional amount 43,070,000 26,775,000 36,274,000 14,204,000        
Notional 63,100,000   63,100,000     18,300,000    
Fair Value 1,100,000   $ 1,100,000     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 0 $ 26,872,000 $ 9,943,000 $ 14,253,000        
Notional 0   0     20,400,000    
Fair Value           200,000    
TBAs (pipeline)                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional           $ 0    
Fair Value (6,000)   (6,000)          
TBAs (pipeline) | Sale contracts                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional $ 46,000,000.0   $ 46,000,000.0