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Allowance for Credit Losses, Credit Quality and Other - Presentation of TDR's on Non-Accrual Status (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | $ 254 | $ 313
Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 105
Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 9
Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 29
Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 2 | 328
Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 5
Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 116
Commercial real estate loans | Non-farm/non-residential | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Non-farm/non-residential | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Non-farm/non-residential | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Non-farm/non-residential | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial real estate loans | Non-farm/non-residential | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Non-farm/non-residential | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Construction/ Land Development | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial real estate loans | Construction/ Land Development | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Construction/ Land Development | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Construction/ Land Development | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Construction/ Land Development | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial real estate loans | Construction/ Land Development | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Construction/ Land Development | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Agricultural | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial real estate loans | Agricultural | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Agricultural | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Agricultural | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Agricultural | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial real estate loans | Agricultural | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial real estate loans | Agricultural | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Residential Real Estate | Residential 1-4 family | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 249 | 299
Residential Real Estate | Residential 1-4 family | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 105
Residential Real Estate | Residential 1-4 family | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 9
Residential Real Estate | Residential 1-4 family | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Residential Real Estate | Residential 1-4 family | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 328
Residential Real Estate | Residential 1-4 family | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Residential Real Estate | Residential 1-4 family | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 116
Total real estate | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 249 | 299
Total real estate | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 105
Total real estate | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 9
Total real estate | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Total real estate | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 328
Total real estate | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Total real estate | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 116
Consumer | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 5 | 14
Consumer | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Consumer | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Consumer | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 29
Consumer | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Consumer | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 5
Consumer | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial & Industrial | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | 0 | 0
Commercial & Industrial | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial & Industrial | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial & Industrial | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial & Industrial | Combination Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans | $ 2 | 0
Commercial & Industrial | Combination Interest Rate Reduction and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | 0
Commercial & Industrial | Combination Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Payment default loans |  | $ 0

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