v3.26.1
Fair value measurements - Mortgage Servicing Rights at Fair Value (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance     $ 287,000
Additions $ 7,000 $ 15,000  
Changes in fair value included in Mortgage banking revenues (a) (9,000) (25,000)  
Ending balance 540,000 540,000  
Changes in fair value $ (16,000) $ (33,000)