v3.26.1
Fair Value - Measurement Basis, Nonrecurring (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Total gains (losses) on assets measured at estimated fair values on a nonrecurring basis      
Notes payable secured by mortgage servicing assets $ 1,426,325   $ 1,326,021
Unsecured Senior Notes 4,834,396   4,831,742
Term Notes and Term Loans      
Total gains (losses) on assets measured at estimated fair values on a nonrecurring basis      
Notes payable secured by mortgage servicing assets 1,326,325   1,326,021
Unsecured senior notes.      
Total gains (losses) on assets measured at estimated fair values on a nonrecurring basis      
Unsecured Senior Notes 4,834,396   4,831,742
Nonrecurring basis      
Financial statement items measured at fair value on a nonrecurring basis      
Real estate acquired in settlement of loans 26,736   8,731
Total gains (losses) on assets measured at estimated fair values on a nonrecurring basis      
Real estate acquired in settlement of loans (3,609) $ (562)  
Nonrecurring basis | Level 3      
Financial statement items measured at fair value on a nonrecurring basis      
Real estate acquired in settlement of loans 26,736   8,731
Total | Term Notes and Term Loans      
Total gains (losses) on assets measured at estimated fair values on a nonrecurring basis      
Notes payable secured by mortgage servicing assets 1,334,166   1,334,248
Total | Unsecured senior notes.      
Total gains (losses) on assets measured at estimated fair values on a nonrecurring basis      
Unsecured Senior Notes $ 4,748,252   $ 5,075,675