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Allowance for Credit Losses - Schedule of allowance for credit losses on off-balance sheet credit exposures (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	$ 35,149	$ 34,196	$ 28,511
Off-Balance Sheet Credit Exposures [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	3,851	3,588
Commercial and Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	5,540	3,316	3,011
Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	5,531	5,733	4,565
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	11,646	11,760	14,138
Real Estate Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	3,447	3,920	2,293
Farm Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	243	269	291
Lease Financing Receivables [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	1,947	2,907	429
Consumer and Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total allowance for credit losses	$ 272	$ 354	$ 98

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

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