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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allowance for loan losses:          
Beginning Balance     $ 5,326 [1] $ 5,321 $ 5,321
Charge-offs     (795) (510) (733)
Recoveries     170 490 638
Provision for (recovery of) loan losses $ 0 $ 0 100 0 100
Ending Balance 4,801 5,301 4,801 5,301 5,326 [1]
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 107 0 107 0 0
Allowance for loan losses, Collectively evaluated for impairment 4,694 5,301 4,694 5,301 5,326
Loans:          
Total Loans 539,821 514,707 539,821 514,707 522,201
Losses, Individually evaluated for impairment 3,007 4,995 3,007 4,995 3,811
Losses, Collectively evaluated for impairment 536,814 509,712 536,814 509,712 518,390
Real estate loans | Construction and Land Development          
Allowance for loan losses:          
Beginning Balance     414 441 441
Charge-offs     0 0 0
Recoveries     0 11 11
Provision for (recovery of) loan losses     128 (17) (38)
Ending Balance 542 435 542 435 414
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 87 0 87 0 0
Allowance for loan losses, Collectively evaluated for impairment 455 435 455 435 414
Loans:          
Total Loans 42,982 37,182 42,982 37,182 35,927
Losses, Individually evaluated for impairment 343 1,959 343 1,959 1,150
Losses, Collectively evaluated for impairment 42,639 35,223 42,639 35,223 34,777
Real estate loans | Secured by 1-4 Family Residential          
Allowance for loan losses:          
Beginning Balance     775 1,019 1,019
Charge-offs     (56) (125) (126)
Recoveries     11 290 302
Provision for (recovery of) loan losses     (5) (422) (420)
Ending Balance 725 762 725 762 775
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 20 0 20 0 0
Allowance for loan losses, Collectively evaluated for impairment 705 762 705 762 775
Loans:          
Total Loans 211,938 203,896 211,938 203,896 208,177
Losses, Individually evaluated for impairment 438 1,654 438 1,654 1,307
Losses, Collectively evaluated for impairment 211,500 202,242 211,500 202,242 206,870
Real estate loans | Other Real Estate          
Allowance for loan losses:          
Beginning Balance     2,948 3,142 3,142
Charge-offs     0 0 0
Recoveries     1 50 50
Provision for (recovery of) loan losses     (677) (232) (244)
Ending Balance 2,272 2,960 2,272 2,960 2,948
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 0 0 0 0 0
Allowance for loan losses, Collectively evaluated for impairment 2,272 2,960 2,272 2,960 2,948
Loans:          
Total Loans 224,903 222,154 224,903 222,154 222,256
Losses, Individually evaluated for impairment 2,029 1,319 2,029 1,319 1,289
Losses, Collectively evaluated for impairment 222,874 220,835 222,874 220,835 220,967
Commercial and industrial loans          
Allowance for loan losses:          
Beginning Balance     418 380 380
Charge-offs     (8) 0 0
Recoveries     6 8 10
Provision for (recovery of) loan losses     26 (1) 28
Ending Balance 442 387 442 387 418
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 0 0 0 0 0
Allowance for loan losses, Collectively evaluated for impairment 442 387 442 387 418
Loans:          
Total Loans 42,861 34,447 42,861 34,447 38,763
Losses, Individually evaluated for impairment 197 63 197 63 65
Losses, Collectively evaluated for impairment 42,664 34,384 42,664 34,384 38,698
Consumer and other loans          
Allowance for loan losses:          
Beginning Balance     771 339 339
Charge-offs     (731) (385) (607)
Recoveries     152 131 265
Provision for (recovery of) loan losses     628 672 774
Ending Balance 820 757 820 757 771
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 0 0 0 0 0
Allowance for loan losses, Collectively evaluated for impairment 820 757 820 757 771
Loans:          
Total Loans 17,137 17,028 17,137 17,028 17,078
Losses, Individually evaluated for impairment 0 0 0 0 0
Losses, Collectively evaluated for impairment $ 17,137 $ 17,028 $ 17,137 $ 17,028 $ 17,078
[1] Derived from audited consolidated financial statements.