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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 27,435	$ 26,197	$ 26,641	$ 25,028
Charge-offs	(74)	(77)	(164)	(148)
Recoveries	112	448	296	858
Provision	300	0	1,000	830
Ending Balance	27,773	26,568	27,773	26,568
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,790	2,320	2,600	2,810
Charge-offs	(22)		(22)	(15)
Recoveries	12	1	16	164
Provision	(51)	191	135	(447)
Ending Balance	2,729	2,512	2,729	2,512
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,729	4,027	4,464	4,057
Recoveries	15		42	6
Provision	182	389	420	353
Ending Balance	4,926	4,416	4,926	4,416
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	14,711	13,546	13,860	12,451
Recoveries	16	381	68	392
Provision	(300)	(757)	499	327
Ending Balance	14,427	13,170	14,427	13,170
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,859	2,531	2,597	2,484
Charge-offs	(39)	(77)	(97)	(114)
Recoveries	64	53	140	232
Provision	152	89	396	(6)
Ending Balance	3,036	2,596	3,036	2,596
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,969	2,177	1,810	2,439
Recoveries				1
Provision	44	282	203	19
Ending Balance	2,013	2,459	2,013	2,459
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	236	290	287	338
Recoveries	1	3	5	9
Provision	14	15	(41)	(39)
Ending Balance	251	308	251	308
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	130	202	176	209
Charge-offs	(13)		(45)	(19)
Recoveries	4	10	25	54
Provision	21		(14)	(32)
Ending Balance	142	212	142	212
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	11	1,104	847	240
Provision	238	(209)	(598)	655
Ending Balance	$ 249	$ 895	$ 249	$ 895

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Amount of allowance for credit loss on accounts receivable.

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Amount of expense related to estimated loss from loan and lease transactions.

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