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Acquisition - Summary of PCD Loans Purchased (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jan. 31, 2025
Mar. 31, 2025
Purchased Financial Assets with Credit Deterioration [Abstract]    
Principal of PCD loans acquired $ 3,237,332  
PCD ACL at acquisition (85,299) $ (62,126)
Non-credit discount on PCD loans (105,512)  
Fair value of PCD Loans $ 3,046,521