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Allowance for Credit Losses, Credit Quality and Other - Presentation of Troubled Debt Restructurings ("TDRs") by Class (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 24,243	$ 24,610
Percentage of Total Class of Loans Receivable	0.16%	0.17%
Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 3,764	$ 3,225
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	951	636
Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	103	149
Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	2,409	3,518
Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,022	938
Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	3	5
Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	15,874	16,023
Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	117	116
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 17,912	$ 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	$ 389	$ 398
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	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	1,307	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	342	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	15,874	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	$ 78	$ 149
Percentage of Total Class of Loans Receivable	0.00%	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	78	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	$ 2,861	$ 1,955
Percentage of Total Class of Loans Receivable	0.15%	0.11%
Residential real estate loans | Residential 1-4 family | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 1,061	$ 560
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	951	598
Residential real estate loans | Residential 1-4 family | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	103	106
Residential real estate loans | Residential 1-4 family | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	23	59
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	606	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	117	116
Total real estate
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 20,851	$ 20,410
Percentage of Total Class of Loans Receivable	0.19%	0.20%
Total real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 1,450	$ 958
Total real estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	951	598
Total real estate | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	103	106
Total real estate | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,408	1,745
Total real estate | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	948	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	15,874	16,023
Total real estate | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	117	116
Consumer
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 18	$ 30
Percentage of Total Class of Loans Receivable	0.00%	0.00%
Consumer | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 6	$ 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	0	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	3	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	$ 3,374	$ 4,170
Percentage of Total Class of Loans Receivable	0.16%	0.18%
Commercial and industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 2,308	$ 2,253
Commercial and industrial | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	38
Commercial and industrial | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	42
Commercial and industrial | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	992	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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