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Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Other Assets [Line Items]    
Other assets $ 323,573 $ 321,152
Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("Federal Reserve")    
Schedule Of Other Assets [Line Items]    
Fair value of equity securities 133,400 135,300
First National Bankers' Bank and Other Miscellaneous Holdings    
Schedule Of Other Assets [Line Items]    
Fair value of equity securities $ 90,300 $ 80,600