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Allowance for Credit Losses, Credit Quality and Other - Presentation of Troubled Debt Restructurings ("TDRs") by Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 122,675	$ 24,610
Percentage of Total Class of Loans Receivable	0.83%	0.17%
Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 3,807	$ 3,225
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	100,311	636
Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	102	149
Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,752	3,518
Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	938	938
Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	2	5
Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	15,646	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	$ 49,697	$ 18,306
Percentage of Total Class of Loans Receivable	0.92%	0.33%
Commercial real estate loans | Non-farm/non-residential | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 388	$ 398
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	32,096	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	1,228	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	339	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	15,646	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	$ 52	$ 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	52	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
Commercial real estate loans | Agricultural
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		$ 0
Percentage of Total Class of Loans Receivable		0.00%
Commercial real estate loans | Agricultural | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		$ 0
Commercial real estate loans | Agricultural | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Commercial real estate loans | Agricultural | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Commercial real estate loans | Agricultural | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Commercial real estate loans | Agricultural | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Commercial real estate loans | Agricultural | Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Commercial real estate loans | Agricultural | Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Commercial real estate loans | Agricultural | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Residential 1-4 family
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 3,038	$ 1,955
Percentage of Total Class of Loans Receivable	0.16%	0.11%
Residential Real Estate | Residential 1-4 family | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 1,076	$ 560
Residential Real Estate | Residential 1-4 family | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,198	598
Residential Real Estate | Residential 1-4 family | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	102	106
Residential Real Estate | Residential 1-4 family | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	22	59
Residential Real Estate | Residential 1-4 family | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	523	516
Residential Real Estate | Residential 1-4 family | Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	0
Residential Real Estate | Residential 1-4 family | Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	0
Residential Real Estate | Residential 1-4 family | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	117	116
Residential Real Estate | Multifamily residential
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		$ 0
Percentage of Total Class of Loans Receivable		0.00%
Residential Real Estate | Multifamily residential | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		$ 0
Residential Real Estate | Multifamily residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Multifamily residential | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Multifamily residential | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Multifamily residential | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Multifamily residential | Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Multifamily residential | Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Residential Real Estate | Multifamily residential | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance		0
Total real estate
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 52,787	$ 20,410
Percentage of Total Class of Loans Receivable	0.48%	0.20%
Total real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 1,464	$ 958
Total real estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	33,294	598
Total real estate | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	102	106
Total real estate | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	1,302	1,745
Total real estate | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	862	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	15,646	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	$ 17	$ 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	2	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 & Industrial
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 69,871	$ 4,170
Percentage of Total Class of Loans Receivable	3.45%	0.18%
Commercial & Industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 2,337	$ 2,253
Commercial & Industrial | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	67,017	38
Commercial & Industrial | Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	42
Commercial & Industrial | Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	441	1,763
Commercial & Industrial | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	76	74
Commercial & Industrial | Principal Reduction and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	0
Commercial & Industrial | Term Extension and Interest Only
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	0	0
Commercial & Industrial | Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Balance	$ 0	$ 0

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