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Securities - Schedule of Other Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Other Securities [Line Items]    
Other securities $ 719,575 $ 471,018
FRB and FHLB stock [Member]    
Schedule of Other Securities [Line Items]    
Other securities 137,406 42,672
Equity Securities With Readily Determinable Fair Values [Member]    
Schedule of Other Securities [Line Items]    
Other securities 41,150 11,596
Equity Securities Without Readily Determinable Fair Values [Member]    
Schedule of Other Securities [Line Items]    
Other securities $ 541,019 $ 416,750