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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 27,033	$ 26,133	$ 26,641	$ 25,028
Charge-offs	(60)	(25)	(90)	(71)
Recoveries	62	89	184	410
Provision	400	0	700	830
Ending Balance	27,435	26,197	27,435	26,197
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,584	2,360	2,600	2,810
Charge-offs		(15)		(15)
Recoveries	3	18	4	163
Provision	203	(43)	186	(638)
Ending Balance	2,790	2,320	2,790	2,320
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,594	4,049	4,464	4,057
Recoveries	27		27	6
Provision	108	(22)	238	(36)
Ending Balance	4,729	4,027	4,729	4,027
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	14,577	13,209	13,860	12,451
Recoveries	4	4	52	11
Provision	130	333	799	1,084
Ending Balance	14,711	13,546	14,711	13,546
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,612	2,509	2,597	2,484
Charge-offs	(57)		(58)	(37)
Recoveries	15	37	76	179
Provision	289	(15)	244	(95)
Ending Balance	2,859	2,531	2,859	2,531
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,863	2,902	1,810	2,439
Recoveries				1
Provision	106	(725)	159	(263)
Ending Balance	1,969	2,177	1,969	2,177
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	249	283	287	338
Recoveries	2	3	4	6
Provision	(15)	4	(55)	(54)
Ending Balance	236	290	236	290
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	136	170	176	209
Charge-offs	(3)	(10)	(32)	(19)
Recoveries	11	27	21	44
Provision	(14)	15	(35)	(32)
Ending Balance	130	202	130	202
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	418	651	847	240
Provision	(407)	453	(836)	864
Ending Balance	$ 11	$ 1,104	$ 11	$ 1,104

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Amount of allowance for credit loss on accounts receivable.

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