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Securities - Schedule of Other Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Other Securities [Line Items]    
Other securities $ 685,590 $ 676,300
FRB and FHLB stock [Member]    
Schedule of Other Securities [Line Items]    
Other securities 137,660 137,498
Equity Securities With Readily Determinable Fair Values [Member]    
Schedule of Other Securities [Line Items]    
Other securities 12,604 14,690
Equity Securities Without Readily Determinable Fair Values [Member]    
Schedule of Other Securities [Line Items]    
Other securities $ 535,326 $ 524,112