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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]      
Impaired loans without a valuation allowance $ 1,131 $ 1,141  
Impaired loans with a valuation allowance 614 711  
Total impaired loans 1,745 1,852  
Valuation allowance related to impaired loans 106 135  
Total non-accrual loans 1,003 1,384  
Total loans past-due ninety days or more and still accruing 0 0 $ 0
Average investment in impaired loans 1,885 1,802 2,509
Interest income recognized on impaired loans 57 64 96
Interest income recognized on a cash basis on impaired loans $ 23 $ 27 $ 60