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Loans and Allowance for Credit Losses - Modified Payment Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	$ 38,901	$ 15,698
Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	38,347	15,332
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	166	88
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	99
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	388	179
Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	1,595	1,821
Residential real estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	1,041	1,455
Residential real estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	166	88
Residential real estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	99
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	388	179
Residential real estate [Member] | Senior Lien
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	1,402	1,624
Residential real estate [Member] | Senior Lien | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	848	1,258
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	166	88
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	0	99
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	388	179
Residential real estate [Member] | Junior Lien
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	193	197
Residential real estate [Member] | Junior Lien | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	193	197
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	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	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	0
Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	33,807	3,871
Commercial, financial, agricultural and other [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	33,807	3,871
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	0	0
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	33,495	3,871
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	33,495	3,871
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	3,321	9,796
Commercial Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	3,321	9,796
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	0	9,673
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	9,673
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
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	3,321	123
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	3,321	123
Commercial Real Estate [Member] | Nonowner 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] | Nonowner 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] | Nonowner 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		30
Loans to individuals [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2		30
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		30
Loans to individuals [Member] | Automobile Loan | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2		30
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
Real estate construction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	178	180
Real estate construction [Member] | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	178	180
Real estate construction [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Real estate construction [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Real estate construction [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
Real estate construction [Member] | Construction Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	178	180
Real estate construction [Member] | Construction Other | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	178	180
Real estate construction [Member] | Construction Other | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Real estate construction [Member] | Construction Other | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0	0
Real estate construction [Member] | Construction Other | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

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