Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Narrative (Details)

v3.24.3
Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]                
Total available-for-sale securities $ 8,506,102,000   $ 8,506,102,000     $ 8,327,149,000    
Mortgage servicing rights, at fair value 2,884,304,000 $ 3,213,113,000 2,884,304,000 $ 3,213,113,000 $ 3,065,415,000 3,052,016,000 $ 3,273,956,000 $ 2,984,937,000
Derivative assets, at fair value 12,572,000   12,572,000     85,291,000    
Derivative liabilities, at fair value (16,764,000)   (16,764,000)     (21,506,000)    
Interest-Only-Strip                
Derivative Instruments, Gain (Loss) [Line Items]                
Total available-for-sale securities 17,400,000   17,400,000     41,900,000    
Interest Rate Contract                
Derivative Instruments, Gain (Loss) [Line Items]                
Net interest expense (income) on interest rate swaps and caps (17,100,000) (6,900,000) (46,400,000) 13,900,000        
Interest rate lock commitments                
Derivative Instruments, Gain (Loss) [Line Items]                
Average notional amount 26,775,000 0 14,204,000 0        
Amount outstanding 33,381,000 0 33,381,000 0 12,879,000 0 0 0
Fair Value 500,000   $ 500,000          
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 26,872,000 0 $ 14,253,000 0        
Amount outstanding 36,398,000 0 36,398,000 0 12,879,000 0 0 $ 0
Fair Value 29,000   29,000          
TBAs, net                
Derivative Instruments, Gain (Loss) [Line Items]                
Average notional amount 13,389,167,000 4,568,757,000 (11,503,991,000)          
Amount outstanding 15,779,095,000 2,841,022,000 15,779,095,000 2,841,022,000 $ 10,588,481,000 $ 15,045,799,000 $ 5,383,706,000  
TBAs, net | Interest Rate Contract                
Derivative Instruments, Gain (Loss) [Line Items]                
Average notional amount $ 13,400,000,000 $ 8,900,000,000 $ 13,300,000,000 $ 6,900,000,000