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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 12,814	$ 13,300	$ 13,134	$ 13,305
Charge-offs	(226)	(357)	(651)	(488)
Recoveries	279	104	384	230
Ending Balance	12,867	13,047	12,867	13,047
Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,359	1,569	1,562	2,018
Charge-offs	(123)		(248)	(1)
Recoveries	85	27	104	83
Provision	309	12	212	(492)
Ending Balance	1,630	1,608	1,630	1,608
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,030	2,259	2,043	2,171
Charge-offs		(210)	(193)	(210)
Recoveries	121	16	130	18
Provision	10	(55)	181	31
Ending Balance	2,161	2,010	2,161	2,010
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	5,670	4,543	5,307	4,606
Charge-offs	(1)		(45)
Recoveries	7	4	21	9
Provision	(541)	192	(148)	124
Ending Balance	5,135	4,739	5,135	4,739
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,750	3,022	1,910	3,089
Charge-offs	(40)	(107)	(62)	(196)
Recoveries	35	32	93	87
Provision	(54)	(271)	(250)	(304)
Ending Balance	1,691	2,676	1,691	2,676
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	820	413	834	420
Recoveries		14		19
Provision	41	55	27	43
Ending Balance	861	482	861	482
Farm Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	411	407	430	442
Recoveries	2		3
Provision	(3)	18	(23)	(17)
Ending Balance	410	425	410	425
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	247	354	290	314
Charge-offs	(62)	(40)	(103)	(81)
Recoveries	29	11	33	14
Provision	86	(1)	80	77
Ending Balance	300	324	300	324
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	527	733	758	245
Provision	152	50	(79)	538
Ending Balance	$ 679	$ 783	$ 679	$ 783

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