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