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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 26,133	$ 16,948	$ 25,028	$ 14,767
Charge-offs	(25)	(116)	(71)	(140)
Recoveries	89	102	410	181
Provision	0	3,486	830	5,612
Ending Balance	26,197	20,420	26,197	20,420
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,360	2,400	2,810	2,219
Charge-offs	(15)	(15)	(15)	(15)
Recoveries	18	3	163	4
Provision	(43)	411	(638)	591
Ending Balance	2,320	2,799	2,320	2,799
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,049	2,810	4,057	2,541
Charge-offs		(1)		(1)
Recoveries		7	6	14
Provision	(22)	595	(36)	857
Ending Balance	4,027	3,411	4,027	3,411
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	13,209	7,617	12,451	6,584
Recoveries	4	37	11	41
Provision	333	1,515	1,084	2,544
Ending Balance	13,546	9,169	13,546	9,169
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,509	1,950	2,484	1,582
Charge-offs		(74)	(37)	(97)
Recoveries	37	31	179	79
Provision	(15)	527	(95)	870
Ending Balance	2,531	2,434	2,531	2,434
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,902	1,606	2,439	1,250
Recoveries		2	1	2
Provision	(725)	236	(263)	592
Ending Balance	2,177	1,844	2,177	1,844
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	283	310	338	344
Recoveries	3	4	6	7
Provision	4	47	(54)	10
Ending Balance	290	361	290	361
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	170	246	209	247
Charge-offs	(10)	(26)	(19)	(27)
Recoveries	27	18	44	34
Provision	15	9	(32)	(7)
Ending Balance	202	247	202	247
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	651	9	240
Provision	453	146	864	155
Ending Balance	$ 1,104	$ 155	$ 1,104	$ 155

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