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Securities - Schedule of Other Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Other Securities [Line Items]    
Other securities $ 333,732 $ 327,098
FRB and FHLB stock [Member]    
Schedule of Other Securities [Line Items]    
Other securities 36,222 36,222
Equity Securities With Readily Determinable Fair Values [Member]    
Schedule of Other Securities [Line Items]    
Other securities 28,182 64,149
Equity Securities Without Readily Determinable Fair Values [Member]    
Schedule of Other Securities [Line Items]    
Other securities $ 269,328 $ 226,727