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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Performing $ 194,792 $ 187,760
Nonperforming 36 38
Total 194,828 187,798
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 174,057 165,048
Nonperforming 36 37
Total 174,093 165,085
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 3,816 6,254
Total 3,816 6,254
Consumer and Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Performing 16,919 16,458
Nonperforming   1
Total $ 16,919 $ 16,459