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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 26,197	$ 20,420	$ 25,028	$ 14,767
Charge-offs	(77)	(185)	(148)	(325)
Recoveries	448	152	858	333
Provision	0	2,250	830	7,862
Ending Balance	26,568	22,637	26,568	22,637
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,320	2,799	2,810	2,219
Charge-offs			(15)	(15)
Recoveries	1	1	164	5
Provision	191	(139)	(447)	452
Ending Balance	2,512	2,661	2,512	2,661
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,027	3,411	4,057	2,541
Charge-offs		(147)		(148)
Recoveries		6	6	20
Provision	389	685	353	1,542
Ending Balance	4,416	3,955	4,416	3,955
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	13,546	9,169	12,451	6,584
Recoveries	381	3	392	44
Provision	(757)	1,406	327	3,950
Ending Balance	13,170	10,578	13,170	10,578
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,531	2,434	2,484	1,582
Charge-offs	(77)	(11)	(114)	(108)
Recoveries	53	117	232	196
Provision	89	(83)	(6)	787
Ending Balance	2,596	2,457	2,596	2,457
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,177	1,844	2,439	1,250
Recoveries		1	1	3
Provision	282	500	19	1,092
Ending Balance	2,459	2,345	2,459	2,345
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	290	361	338	344
Recoveries	3	3	9	10
Provision	15	(4)	(39)	6
Ending Balance	308	360	308	360
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	202	247	209	247
Charge-offs		(27)	(19)	(54)
Recoveries	10	21	54	55
Provision		(21)	(32)	(28)
Ending Balance	212	220	212	220
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,104	155	240
Provision	(209)	(94)	655	61
Ending Balance	$ 895	$ 61	$ 895	$ 61

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