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Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule Of Other Assets [Line Items]    
Other assets $ 383,400 $ 345,292
Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("Federal Reserve")    
Schedule Of Other Assets [Line Items]    
Fair value of equity securities 130,400 135,200
First National Bankers' Bank and Other Miscellaneous Holdings    
Schedule Of Other Assets [Line Items]    
Fair value of equity securities $ 95,300 $ 91,200