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Loans and Allowance for Credit Losses - Modified Payment Status (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	$ 17,794	$ 10,471
Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	17,451	10,471
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	84	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	259	0
Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	795	758
Residential real estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	616	758
Residential real estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Residential real estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	84	0
Residential real estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	95	0
Residential real estate [Member] | Senior Lien
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	768	758
Residential real estate [Member] | Senior Lien | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	589	758
Residential real estate [Member] | Senior Lien | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Residential real estate [Member] | Senior Lien | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	84	0
Residential real estate [Member] | Senior Lien | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	95	0
Residential real estate [Member] | Junior Lien
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	27
Residential real estate [Member] | Junior Lien | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	27
Residential real estate [Member] | Junior Lien | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Residential real estate [Member] | Junior Lien | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Residential real estate [Member] | Junior Lien | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	7,293	50
Commercial, financial, agricultural and other [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	7,129	50
Commercial, financial, agricultural and other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial, financial, agricultural and other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial, financial, agricultural and other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	164	0
Commercial, financial, agricultural and other [Member] | Equipment Finance
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	164
Commercial, financial, agricultural and other [Member] | Equipment Finance | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Commercial, financial, agricultural and other [Member] | Equipment Finance | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Commercial, financial, agricultural and other [Member] | Equipment Finance | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Commercial, financial, agricultural and other [Member] | Equipment Finance | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	164
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	7,129	50
Commercial, financial, agricultural and other [Member] | Time and Demand Loans | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	7,129	50
Commercial, financial, agricultural and other [Member] | Time and Demand Loans | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial, financial, agricultural and other [Member] | Time and Demand Loans | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial, financial, agricultural and other [Member] | Time and Demand Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	9,674	9,663
Commercial Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	9,674	9,663
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	9,674	9,663
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	9,674	9,663
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	$ 0
Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	32
Loans to individuals [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	32
Loans to individuals [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Loans to individuals [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Loans to individuals [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Loans to individuals [Member] | Automobile Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	32
Loans to individuals [Member] | Automobile Loan | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	32
Loans to individuals [Member] | Automobile Loan | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Loans to individuals [Member] | Automobile Loan | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0
Loans to individuals [Member] | Automobile Loan | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	$ 0

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No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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-Paragraph 42
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