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Commitments, Credit Risk and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Percentage of commitments to extend credit dependent upon the financial condition of the customers 72.40%  
Allowance for credit losses on loan commitments that are not unconditionally cancellable $ 19.2 $ 13.7