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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Allowance for Loan Losses
Balance at beginning of year	$ 25,826	$ 25,024	$ 25,024
Provision for (recovery of) credit losses - loans	811	(289)	944
Charge Offs	(335)	(192)	(480)
Recoveries	50	137	338
Balance at ending of year	26,352	24,680	25,826
Consumer Real Estate [Member]
Allowance for Loan Losses
Balance at beginning of year	3,543	3,581	3,581
Provision for (recovery of) credit losses - loans	139	(290)	(31)
Charge Offs		(10)	(13)
Recoveries	1	4	6
Balance at ending of year	3,683	3,285	3,543
Agricultural Real Estate [Member]
Allowance for Loan Losses
Balance at beginning of year	895	312	312
Provision for (recovery of) credit losses - loans	(124)	859	583
Balance at ending of year	771	1,171	895
Agricultural [Member]
Allowance for Loan Losses
Balance at beginning of year	285	336	336
Provision for (recovery of) credit losses - loans	12	41	(52)
Recoveries	9		1
Balance at ending of year	306	377	285
Commercial Real Estate [Member]
Allowance for Loan Losses
Balance at beginning of year	16,560	17,400	17,400
Provision for (recovery of) credit losses - loans	344	(1,450)	(834)
Charge Offs			(15)
Recoveries	3	3	9
Balance at ending of year	16,907	15,953	16,560
Commercial and Industrial [Member]
Allowance for Loan Losses
Balance at beginning of year	2,969	1,766	1,766
Provision for (recovery of) credit losses - loans	215	517	1,176
Charge Offs	(25)	(101)	(106)
Recoveries	6	66	133
Balance at ending of year	3,165	2,248	2,969
Consumer [Member]
Allowance for Loan Losses
Balance at beginning of year	1,012	1,302	1,302
Provision for (recovery of) credit losses - loans	219	(123)	(133)
Charge Offs	(310)	(81)	(346)
Recoveries	31	64	189
Balance at ending of year	952	1,162	1,012
Other [Member]
Allowance for Loan Losses
Balance at beginning of year	562	327	327
Provision for (recovery of) credit losses - loans	6	157	235
Balance at ending of year	$ 568	$ 484	$ 562

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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