v3.26.1
Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivative [Line Items]                
Average notional amount $ 9,870,332,000 $ 18,778,774,000 $ 11,755,121,000 $ 19,580,828,000        
Total available-for-sale securities 5,091,319,000   5,091,319,000     $ 6,514,471,000    
Mortgage servicing rights, at fair value 2,336,324,000 3,015,643,000 2,336,324,000 3,015,643,000 $ 2,380,983,000 2,421,910,000 $ 2,959,773,000 $ 2,994,271,000
Derivative assets, at fair value 69,366,000   69,366,000     87,549,000    
Derivative liabilities, at fair value 1,891,000   $ 1,891,000     4,254,000    
Warehouse Lines of Credit                
Derivative [Line Items]                
Weighted average remaining maturities     60 days          
Interest-Only-Strip                
Derivative [Line Items]                
Total available-for-sale securities 8,400,000   $ 8,400,000     9,000,000.0    
Interest Rate Contract                
Derivative [Line Items]                
Net interest income on interest rate swaps 1,300,000 6,400,000 3,000,000.0 12,400,000        
Average notional amount 11,600,000,000 19,100,000,000 12,400,000,000 19,700,000,000        
Interest rate lock commitments                
Derivative [Line Items]                
Average notional amount 50,385,000 33,461,000 59,373,000 31,194,000        
Notional 39,600,000   39,600,000     49,600,000    
Net carrying value 700,000   $ 700,000     900,000    
Interest rate lock commitments | Minimum                
Derivative [Line Items]                
Funding or cancellation or expiration of lock commitment     30 days          
Interest rate lock commitments | Maximum                
Derivative [Line Items]                
Funding or cancellation or expiration of lock commitment     90 days          
Interest rate lock commitments, Pull-through adjusted                
Derivative [Line Items]                
Notional 31,100,000   $ 31,100,000     37,700,000    
Forward mortgage loan sale commitments                
Derivative [Line Items]                
Average notional amount 0 $ 4,922,000 0 $ 14,997,000        
Notional 0   0     0    
TBAs (pipeline)                
Derivative [Line Items]                
Net carrying value (200,000)   (200,000)     (100,000)    
TBAs (pipeline) | Sale contracts                
Derivative [Line Items]                
Notional $ 27,000,000.0   $ 27,000,000.0     $ 35,000,000.0