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Allowance for Credit Losses, Credit Quality and Other - Presentation of Troubled Debt Restructurings ("TDRs") by Class (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 24,941 | $ 24,610
Percentage of Total Class of Loans Receivable | 0.17% | 0.17%
Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 3,279 | $ 3,225
Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 1,219 | 636
Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 110 | 149
Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 3,270 | 3,518
Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 921 | 938
Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 4 | 5
Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 16,023 | 16,023
Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 115 | 116
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 18,638 | $ 18,306
Percentage of Total Class of Loans Receivable | 0.33% | 0.33%
Commercial real estate loans | Non-farm/non-residential | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 396 | $ 398
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 457 | 0
Commercial real estate loans | Non-farm/non-residential | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Non-farm/non-residential | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 1,415 | 1,537
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 347 | 348
Commercial real estate loans | Non-farm/non-residential | Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Non-farm/non-residential | Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 16,023 | 16,023
Commercial real estate loans | Non-farm/non-residential | Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Construction/land development |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 121 | $ 149
Percentage of Total Class of Loans Receivable | 0.01% | 0.01%
Commercial real estate loans | Construction/land development | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 0 | $ 0
Commercial real estate loans | Construction/land development | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Construction/land development | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Construction/land development | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 121 | 149
Commercial real estate loans | Construction/land development | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Construction/land development | Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Construction/land development | Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial real estate loans | Construction/land development | Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 2,126 | $ 1,955
Percentage of Total Class of Loans Receivable | 0.11% | 0.11%
Residential real estate loans | Residential 1-4 family | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 626 | $ 560
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 724 | 598
Residential real estate loans | Residential 1-4 family | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 105 | 106
Residential real estate loans | Residential 1-4 family | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 56 | 59
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 500 | 516
Residential real estate loans | Residential 1-4 family | Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Residential real estate loans | Residential 1-4 family | Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Residential real estate loans | Residential 1-4 family | Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 115 | 116
Total real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 20,885 | $ 20,410
Percentage of Total Class of Loans Receivable | 0.20% | 0.20%
Total real estate | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 1,022 | $ 958
Total real estate | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 1,181 | 598
Total real estate | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 105 | 106
Total real estate | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 1,592 | 1,745
Total real estate | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 847 | 864
Total real estate | Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Total real estate | Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 16,023 | 16,023
Total real estate | Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 115 | 116
Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 14 | $ 30
Percentage of Total Class of Loans Receivable | 0.00% | 0.00%
Consumer | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 0 | $ 14
Consumer | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Consumer | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 1 | 1
Consumer | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 9 | 10
Consumer | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Consumer | Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 4 | 5
Consumer | Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Consumer | Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial and industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 4,042 | $ 4,170
Percentage of Total Class of Loans Receivable | 0.18% | 0.18%
Commercial and industrial | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 2,257 | $ 2,253
Commercial and industrial | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 38 | 38
Commercial and industrial | Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 4 | 42
Commercial and industrial | Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 1,669 | 1,763
Commercial and industrial | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 74 | 74
Commercial and industrial | Principal Reduction and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial and industrial | Term Extension and Interest Only |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | 0 | 0
Commercial and industrial | Term Extension and Principal Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Post- Modification Outstanding Balance | $ 0 | $ 0

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