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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Contingencies And Commitments [Line Items]    
Commitments to extend credit $ 1,730.0 $ 1,580.0
Obligations under letters of credit 50.3 44.9
Reserve for credit risk for undisbursed commitments 8.0 $ 8.0
Available lines of credit 6,770.0  
Secured [Member]    
Contingencies And Commitments [Line Items]    
Available lines of credit $ 3,850.0