Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Performing	$ 496,735	$ 378,785
Total	496,735	378,785
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	432,790	347,847
Total	432,790	347,847
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	44,172	20,713
Total	44,172	20,713
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	19,773	10,225
Total	$ 19,773	$ 10,225