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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Performing $ 177,749 $ 173,309
Nonperforming 0 0
Total 177,749 173,309
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 161,847 158,169
Nonperforming 0 0
Total 161,847 158,169
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 6,514 5,808
Nonperforming 0 0
Total 6,514 5,808
Consumer and Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 9,388 9,332
Nonperforming 0 0
Total $ 9,388 $ 9,332