v3.26.1
INVESTMENT SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
AFS investment securities $ 13,971,122 $ 13,580,285
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
AFS investment securities 1,612,790 1,544,147
U.S. Treasuries | Asset Pledged as Collateral    
Debt Securities, Available-for-sale [Line Items]    
AFS investment securities $ 260,400 $ 250,600