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Bank Premises and Equipment - Narrative (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]      
Depreciation, occupancy and amortization of leasehold improvement $ 3.3 $ 2.3 $ 2.2