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Allowance for Loan Losses - Schedule of Loans and Reserve Balances by Loan Segment Both Individually and Collectively Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]            
Individually Evaluated, Reserve $ 157   $ 139      
Individually Evaluated, Loans 5,711   6,089      
Collectively Evaluated, Reserve 2,394   2,568      
Collectively Evaluated, Loans 347,468   335,740      
Total Reserve 2,551 $ 2,677 2,707 $ 2,706 $ 2,810 $ 2,884
Total Loans 353,179   341,829      
Commercial [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Individually Evaluated, Reserve 13   16      
Individually Evaluated, Loans 1,796   1,993      
Collectively Evaluated, Reserve 1,310   1,388      
Collectively Evaluated, Loans 204,312   190,229      
Total Reserve 1,323 1,439 1,404 1,346 1,315 1,310
Total Loans 206,108   192,222      
Non-Commercial [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Individually Evaluated, Reserve 144   123      
Individually Evaluated, Loans 3,915   4,096      
Collectively Evaluated, Reserve 1,084   1,180      
Collectively Evaluated, Loans 143,156   145,511      
Total Reserve 1,228 $ 1,238 1,303 $ 1,360 $ 1,495 $ 1,574
Total Loans $ 147,071   $ 149,607