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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 12,867	$ 13,047	$ 13,134	$ 13,305
Charge-offs	(133)	(309)	(784)	(797)
Recoveries	207	208	591	438
Provision	390		390
Ending Balance	13,331	12,946	13,331	12,946
Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,630	1,608	1,562	2,018
Charge-offs		(10)	(248)	(11)
Recoveries	64	51	168	134
Provision	(63)	(38)	149	(530)
Ending Balance	1,631	1,611	1,631	1,611
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,161	2,010	2,043	2,171
Charge-offs		(91)	(193)	(301)
Recoveries	18	8	148	26
Provision	(136)	146	45	177
Ending Balance	2,043	2,073	2,043	2,073
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	5,135	4,739	5,307	4,606
Charge-offs	(76)	(38)	(121)	(38)
Recoveries	2	33	23	42
Provision	384	539	236	663
Ending Balance	5,445	5,273	5,445	5,273
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,691	2,676	1,910	3,089
Charge-offs	(12)	(116)	(74)	(312)
Recoveries	88	77	181	164
Provision	32	(158)	(218)	(462)
Ending Balance	1,799	2,479	1,799	2,479
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	861	482	834	420
Recoveries		13		32
Provision	120	172	147	215
Ending Balance	981	667	981	667
Farm Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	410	425	430	442
Recoveries	1	2	4	2
Provision	(18)	(3)	(41)	(20)
Ending Balance	393	424	393	424
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	300	324	290	314
Charge-offs	(45)	(54)	(148)	(135)
Recoveries	34	24	67	38
Provision	26	31	106	108
Ending Balance	315	325	315	325
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	679	783	758	245
Provision	45	(689)	(34)	(151)
Ending Balance	$ 724	$ 94	$ 724	$ 94

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