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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Performing $ 208,098 $ 201,018
Nonperforming 7 9
Total 208,105 201,027
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 184,970 179,721
Total 184,970 179,721
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 6,433 5,572
Total 6,433 5,572
Consumer and Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 16,695 15,725
Nonperforming 7 9
Total $ 16,702 $ 15,734