v3.25.2
Assets Sold Under Agreements to Repurchase - Summary of Financial Information Relating to Assets Sold under Agreements to Repurchase (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]          
Weighted average interest rate 5.19% 6.09% 5.20% 6.13%  
Average balance $ 6,382,670,000 $ 5,016,206,000 $ 6,282,348,000 $ 5,080,520,000  
Total interest expense 84,336,000 77,364,000 165,484,000 157,921,000  
Maximum daily amount outstanding 7,603,144,000 $ 5,525,266,000 7,799,203,000 $ 6,562,795,000  
Assets Sold Under Agreements To Repurchase 6,833,086,000   6,833,086,000   $ 6,509,415,000
Assets sold under agreements to repurchase, At year end 6,826,855,000   $ 6,826,855,000   $ 6,500,938,000
Weighted average interest rate     5.15%   5.37%
Available borrowing capacity, Committed     $ 351,946,000   $ 565,488,000
Available borrowing capacity, Uncommitted     4,847,534,000   4,559,239,000
Available borrowing capacity     5,199,480,000   5,124,727,000
Margin deposits placed with counterparties included in Other assets, net 91,162,000   91,162,000   296,922,000
Assets Sold Under Agreements to Repurchase [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Unamortized debt issuance costs (6,231,000)   (6,231,000)   (8,477,000)
Mortgage Backed Securities at Fair Value [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 3,967,045,000   3,967,045,000   4,063,706,000
Loans Acquired For Sale At Fair Value [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 2,575,290,000   2,575,290,000   2,075,473,000
Loans Held for Investment at Fair Value [Member] | Securities Retained In Asset Backed Financings [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 340,285,000   340,285,000   130,839,000
Loans Held for Investment at Fair Value [Member] | Distressed loans [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 0   0   160,000
Servicing advances [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 34,684,000   34,684,000   50,333,000
Real estate acquired in settlement of loans [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 0   0   527,000
Mortgage Service Rights at Fair Value [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 1,821,272,000   1,821,272,000   1,906,043,000
Deposits Securing Credit Risk Transfer Arrangements [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value 191,306,000   191,306,000   199,965,000
Derivative Assets [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Assets Sold under Agreements to Repurchase, Market Value $ 23,040,000   $ 23,040,000   $ 0