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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Allowance for loan losses:
Beginning Balance	$ 5,524	$ 6,718
Charge-offs	(788)	(1,838)
Recoveries	585	744
Provision for (recovery of) loan losses		(100)
Ending Balance	5,321	5,524
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	37	544
Allowance for loan losses, Collectively evaluated for impairment	5,284	4,980
Loans:
Ending Balance	486,067	438,999
Loans, Individually evaluated for impairment	4,860	7,705
Loans, Collectively evaluated for impairment	481,207	431,294
Construction and Land Development [Member]
Allowance for loan losses:
Beginning Balance	1,532	1,403
Recoveries	4	4
Provision for (recovery of) loan losses	(1,095)	125
Ending Balance	441	1,532
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment		326
Allowance for loan losses, Collectively evaluated for impairment	441	1,206
Loans:
Ending Balance	34,699	33,135
Loans, Individually evaluated for impairment	1,973	2,544
Loans, Collectively evaluated for impairment	32,726	30,591
Secured by 1-4 Family Residential [Member]
Allowance for loan losses:
Beginning Balance	939	1,204
Charge-offs	(83)	(142)
Recoveries	293	373
Provision for (recovery of) loan losses	(130)	(496)
Ending Balance	1,019	939
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	37	23
Allowance for loan losses, Collectively evaluated for impairment	982	916
Loans:
Ending Balance	198,763	189,286
Loans, Individually evaluated for impairment	1,828	2,044
Loans, Collectively evaluated for impairment	196,935	187,242
Other Real Estate [Member]
Allowance for loan losses:
Beginning Balance	2,534	3,658
Charge-offs	(165)	(1,125)
Recoveries	2	2
Provision for (recovery of) loan losses	771	(1)
Ending Balance	3,142	2,534
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment		195
Allowance for loan losses, Collectively evaluated for impairment	3,142	2,339
Loans:
Ending Balance	211,210	181,447
Loans, Individually evaluated for impairment	984	3,023
Loans, Collectively evaluated for impairment	210,226	178,424
Commercial and Industrial [Member]
Allowance for loan losses:
Beginning Balance	306	310
Charge-offs		(59)
Recoveries	11	72
Provision for (recovery of) loan losses	63	(17)
Ending Balance	380	306
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	380	306
Loans:
Ending Balance	29,981	24,048
Loans, Individually evaluated for impairment	75	94
Loans, Collectively evaluated for impairment	29,906	23,954
Consumer and Other Loans [Member]
Allowance for loan losses:
Beginning Balance	213	143
Charge-offs	(540)	(512)
Recoveries	275	293
Provision for (recovery of) loan losses	391	289
Ending Balance	339	213
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	339	213
Loans:
Ending Balance	11,414	11,083
Loans, Collectively evaluated for impairment	$ 11,414	$ 11,083

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Financing receivable loans and leases receivable.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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-Publisher FASB
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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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