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Allowance for Credit Losses - Changes in the Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	$ 40,284	$ 38,849	$ 39,669	$ 37,160	$ 37,160
Charge-offs	(1,092)	(887)	(2,068)	(1,538)
Recoveries	92	157	435	455
Provision	1,171	1,800	2,419	3,842
Ending Balance	40,455	39,919	40,455	39,919	39,669
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	6,194	7,737	6,586	7,587	7,587
Charge-offs	(363)	(812)	(435)	(1,024)
Recoveries	44	97	335	249
Provision	182	(1,674)	(429)	(1,464)
Ending Balance	6,057	5,348	6,057	5,348	6,586
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	4,466	4,652	4,327	4,723	4,723
Recoveries	0	1		4
Provision	146	(325)	285	(399)
Ending Balance	4,612	4,328	4,612	4,328	4,327
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	11,412	12,968	11,404	12,056	12,056
Charge-offs	(550)		(1,350)	(174)
Recoveries	3	5	3	10
Provision	456	1,448	1,264	2,529
Ending Balance	11,321	14,421	11,321	14,421	11,404
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	12,455	9,074	11,866	8,489	8,489
Charge-offs	(115)	(52)	(115)	(65)
Recoveries	23	38	42	158
Provision	712	356	1,282	834
Ending Balance	13,075	9,416	13,075	9,416	11,866
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	4,017	3,433	3,708	3,388	3,388
Recoveries		8		12
Provision	(322)	206	(13)	247
Ending Balance	3,695	3,647	3,695	3,647	3,708
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	264	320	226	260	260
Provision	41	(59)	79	1
Ending Balance	305	261	305	261	226
Lease Financing Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	1,277	359	1,361	297	297
Charge-offs	(62)		(152)	(226)
Recoveries	17	1	42	1
Provision	(18)	1,850	(37)	2,138
Ending Balance	1,214	2,210	1,214	2,210	1,361
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	199	306	191	341	341
Charge-offs	(2)	(23)	(16)	(49)
Recoveries	5	7	13	21
Provision	(26)	(22)	(12)	(45)
Ending Balance	$ 176	268	$ 176	268	191
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance				19	$ 19
Provision		20		1
Ending Balance		$ 20		$ 20

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