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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, 2025	Dec. 31, 2024
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 122,180	$ 122,675
Percentage of Total Class of Loans Receivable	0.82%	0.83%
Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 3,825	$ 3,807
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	99,133	100,311
Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	102	102
Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,692	1,752
Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,888	938
Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1	2
Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	15,423	15,646
Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	116	117
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 49,246	$ 49,697
Percentage of Total Class of Loans Receivable	0.88%	0.92%
Commercial real estate loans | Non-farm/non-residential | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 385	$ 388
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	31,926	32,096
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	1,175	1,228
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	337	339
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	15,423	15,646
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	$ 47	$ 52
Percentage of Total Class of Loans Receivable	0.00%	0.00%
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	47	52
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	$ 3,971	$ 3,038
Percentage of Total Class of Loans Receivable	0.20%	0.16%
Residential real estate loans | Residential 1-4 family | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 1,063	$ 1,076
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,194	1,198
Residential real estate loans | Residential 1-4 family | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	101	102
Residential real estate loans | Residential 1-4 family | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	21	22
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,476	523
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	116	117
Total real estate
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 53,264	$ 52,787
Percentage of Total Class of Loans Receivable	0.48%	0.48%
Total real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 1,448	$ 1,464
Total real estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	33,120	33,294
Total real estate | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	101	102
Total real estate | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,243	1,302
Total real estate | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,813	862
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	15,423	15,646
Total real estate | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	116	117
Consumer
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 2,980	$ 17
Percentage of Total Class of Loans Receivable	0.24%	0.00%
Consumer | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 6	$ 6
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	2,964	0
Consumer | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1	0
Consumer | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	8	9
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	1	2
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	$ 65,936	$ 69,871
Percentage of Total Class of Loans Receivable	3.22%	3.45%
Commercial and industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 2,371	$ 2,337
Commercial and industrial | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	63,049	67,017
Commercial and industrial | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	0
Commercial and industrial | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	441	441
Commercial and industrial | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	75	76
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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