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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Performing $ 405,369 $ 407,201
Nonperforming 10  
Total 405,379 407,201
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 381,544 378,999
Total 381,544 378,999
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 7,982 10,372
Total 7,982 10,372
Consumer and Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 15,843 17,830
Nonperforming 10  
Total $ 15,853 $ 17,830