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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment	$ 107		$ 141
Allowance for loan losses, Collectively evaluated for impairment	13,679		13,530
Allowance for loan losses, Total	13,786	$ 13,822	13,679	$ 12,867	$ 12,814	$ 13,134
Outstanding loan balances, Individually evaluated for impairment	3,013		2,857
Outstanding loan balances, Collectively evaluated for impairment	1,595,169		1,558,160
Outstanding loan balances, Total	1,598,770		1,561,941
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with credit deterioration			8
Loan balance of loans acquired with credit deterioration	588		924
Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	1,828		1,747
Allowance for loan losses, Total	1,828	1,834	1,747	1,630	1,359	1,562
Outstanding loan balances, Individually evaluated for impairment	367		367
Outstanding loan balances, Collectively evaluated for impairment	186,027		176,693
Outstanding loan balances, Total	186,423		177,101
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance of loans acquired with credit deterioration	29		41
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment	10		12
Allowance for loan losses, Collectively evaluated for impairment	1,999		1,950
Allowance for loan losses, Total	2,009	1,979	1,962	2,161	2,030	2,043
Outstanding loan balances, Individually evaluated for impairment	459		484
Outstanding loan balances, Collectively evaluated for impairment	217,724		209,637
Outstanding loan balances, Total	218,183		210,121
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	5,867		5,803
Allowance for loan losses, Total	5,867	5,989	5,803	5,135	5,670	5,307
Outstanding loan balances, Individually evaluated for impairment	379		31
Outstanding loan balances, Collectively evaluated for impairment	530,191		523,567
Outstanding loan balances, Total	530,570		523,598
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment	97		122
Allowance for loan losses, Collectively evaluated for impairment	1,601		1,401
Allowance for loan losses, Total	1,698	1,434	1,531	1,691	1,750	1,910
Outstanding loan balances, Individually evaluated for impairment	1,126		1,279
Outstanding loan balances, Collectively evaluated for impairment	464,896		455,688
Outstanding loan balances, Total	466,581		457,850
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with credit deterioration			8
Loan balance of loans acquired with credit deterioration	559		883
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	1,135		1,046
Allowance for loan losses, Total	1,135	971	1,046	861	820	834
Outstanding loan balances, Collectively evaluated for impairment	144,448		135,195
Outstanding loan balances, Total	144,448		135,195
Farm Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment			7
Allowance for loan losses, Collectively evaluated for impairment	365		390
Allowance for loan losses, Total	365	366	397	410	411	430
Outstanding loan balances, Individually evaluated for impairment	682		696
Outstanding loan balances, Collectively evaluated for impairment	35,434		37,817
Outstanding loan balances, Total	36,116		38,513
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	201		284
Allowance for loan losses, Total	201	251	284	300	247	290
Outstanding loan balances, Collectively evaluated for impairment	16,449		19,563
Outstanding loan balances, Total	16,449		19,563
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	683		909
Allowance for loan losses, Total	$ 683	$ 998	$ 909	$ 679	$ 527	$ 758

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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