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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]    
Performing $ 382,911,000 $ 407,051,000
Total 382,911,000 407,051,000
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 354,987,000 382,720,000
Total 354,987,000 382,720,000
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 15,948,000 10,565,000
Total 15,948,000 10,565,000
Consumer and Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 11,976,000 13,766,000
Total $ 11,976,000 $ 13,766,000