v3.26.1
Loans and Allowance for Credit Losses - Modified Payment Status (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 $ 38,291 $ 15,304
Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 22,597 10,615
Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 0 1,823
Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 19 23
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 15,675 2,843
Residential real estate [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 466 2,394
Residential real estate [Member] | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 217 227
Residential real estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 0 1,823
Residential real estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 19 23
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 230 321
Residential real estate [Member] | Senior Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 466 2,349
Residential real estate [Member] | Senior Lien | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 217 182
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 1,823
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 19 23
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 230 321
Residential real estate [Member] | Junior Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2   45
Residential real estate [Member] | Junior Lien | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2   45
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 1,852 3,511
Commercial, financial, agricultural and other [Member] | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 1,852 989
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 2,522
Commercial, financial, agricultural and other [Member] | Equipment Finance    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2   125
Commercial, financial, agricultural and other [Member] | Equipment Finance | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2   125
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   0
Commercial, financial, agricultural and other [Member] | Time and Demand Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 1,852 3,386
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 1,852 864
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 2,522
Commercial Real Estate [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 35,973 9,399
Commercial Real Estate [Member] | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 20,528 9,399
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 15,445 0
Commercial Real Estate [Member] | Multifamily    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 10,836  
Commercial Real Estate [Member] | Multifamily | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 0  
Commercial Real Estate [Member] | Multifamily | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 0  
Commercial Real Estate [Member] | Multifamily | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 0  
Commercial Real Estate [Member] | Multifamily | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 10,836  
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 25,137 9,399
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 20,528 9,399
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 $ 4,609 $ 0