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Allowance for Loan Losses - Summary of Loans Deemed Impaired and Specific Reserves Allocated by Class (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance $ 6,107 $ 6,627 $ 6,016
Recorded Investment With No Allowance 2,802 3,923 2,383
Recorded Investment With Allowance 2,767 2,166 3,095
Related Allowance 194 139 181
Average Recorded Investment 5,767 5,777 6,384
Interest Income 263 287 253
Real Estate - Commercial [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance 1,593 1,671 620
Recorded Investment With No Allowance 1,305 1,552 498
Recorded Investment With Allowance 288 119 122
Related Allowance 9 9 9
Average Recorded Investment 1,650 887 1,121
Interest Income 72 64 42
Other Real Estate Construction [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance 689 831 840
Recorded Investment With No Allowance 101 190 195
Recorded Investment With Allowance 50 103 107
Related Allowance 3 5 7
Average Recorded Investment 208 296 281
Interest Income 5 6 3
Real Estate 1 - 4 Family Construction [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance   6 13
Recorded Investment With Allowance   6 13
Average Recorded Investment 3 9 16
Interest Income   1 1
Real Estate - Residential [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance 3,701 3,994 4,343
Recorded Investment With No Allowance 1,319 2,072 1,507
Recorded Investment With Allowance 2,382 1,922 2,836
Related Allowance 171 123 163
Average Recorded Investment 3,762 4,434 4,798
Interest Income 179 201 200
Home Equity [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance 35 35 28
Recorded Investment With No Allowance 22 35 28
Recorded Investment With Allowance 13    
Related Allowance 1    
Average Recorded Investment 66 49 50
Interest Income 1 1 1
Commercial Loan [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance 44 29 97
Recorded Investment With No Allowance 10 13 80
Recorded Investment With Allowance 34 16 17
Related Allowance 10 2 2
Average Recorded Investment 25 31 81
Interest Income 2 8 4
Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid Principal Balance 45 61 75
Recorded Investment With No Allowance 45 61 75
Average Recorded Investment 53 71 37
Interest Income $ 4 $ 6 $ 2