Loans and Allowance for Credit Losses - Schedule of Allowance for Loan Losses by Portfolio Segment Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	$ 64,245	$ 45,824	$ 52,756	$ 43,267
Provision for credit losses	1,304	19	7,259	2,741
Initial allowance on purchase credit deteriorated ("PCD") loan	524		4,144
Initial allowance on purchased seasoned loans			3,293
Loans charged-off	(2,955)	(1,118)	(5,036)	(2,257)
Recoveries	1,295	545	1,997	1,519
Allowance for Loan Losses, Ending Balance	64,413	45,270	64,413	45,270
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	22,882	16,122	20,037	14,948
Provision for credit losses	159	64	1,082	818
Initial allowance on purchase credit deteriorated ("PCD") loan	524		1,379
Initial allowance on purchased seasoned loans			1,108
Loans charged-off	(33)	(228)	(105)	(250)
Recoveries	135	292	166	734
Allowance for Loan Losses, Ending Balance	23,667	16,250	23,667	16,250
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	23,850	13,548	17,830	14,005
Provision for credit losses	1,171	(24)	5,638	(394)
Initial allowance on purchase credit deteriorated ("PCD") loan			1,962
Initial allowance on purchased seasoned loans			718
Loans charged-off	(2,406)	(409)	(4,106)	(852)
Recoveries	710	74	1,283	478
Allowance for Loan Losses, Ending Balance	23,325	13,237	23,325	13,237
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	7,701	8,827	8,068	8,553
Provision for credit losses	(221)	184	(834)	94
Initial allowance on purchase credit deteriorated ("PCD") loan			160
Initial allowance on purchased seasoned loans			114
Loans charged-off	(1)	(109)	(30)	(122)
Recoveries	3	8	4	17
Allowance for Loan Losses, Ending Balance	7,482	8,542	7,482	8,542
Agricultural Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	7,665	5,158	4,669	3,504
Provision for credit losses	270	25	1,056	1,581
Initial allowance on purchase credit deteriorated ("PCD") loan			440
Initial allowance on purchased seasoned loans			1,254
Loans charged-off	(163)	(21)	(199)	(27)
Recoveries	355	20	367	74
Allowance for Loan Losses, Ending Balance	7,587	5,132	7,587	5,132
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	291	356	337	439
Provision for credit losses	(326)	(53)	65	(120)
Initial allowance on purchase credit deteriorated ("PCD") loan			202
Initial allowance on purchased seasoned loans			12
Loans charged-off	(44)	(76)	(47)	(93)
Recoveries	36	41	40	42
Allowance for Loan Losses, Ending Balance	609	268	609	268
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	1,856	1,813	1,815	1,818
Provision for credit losses	139	193	252	762
Initial allowance on purchase credit deteriorated ("PCD") loan			1
Initial allowance on purchased seasoned loans			87
Loans charged-off	(308)	(275)	(549)	(913)
Recoveries	56	110	137	174
Allowance for Loan Losses, Ending Balance	$ 1,743	$ 1,841	$ 1,743	$ 1,841

Financing receivable initial allowance on purchased seasoned loans.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from purchase of loan. Excludes financing receivable purchased with credit deterioration, loan acquired through business combination or acquisition, and net investment in lease.

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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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