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Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Loans on Nonaccrual Status and Loans Past Due Over 90 Days Still Accruing (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 93,853	$ 59,971
Nonaccrual With Reserve	28,768	2,534
Loans Past Due Over 90 Days Still Accruing	5,034	4,130
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	35,868	13,178
Nonaccrual With Reserve	28,768	0
Loans Past Due Over 90 Days Still Accruing	304	2,177
Commercial real estate loans | Construction/ Land Development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	3,702	12,094
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	600	255
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	559	431
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	0
Residential Real Estate | Residential 1-4 family
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	22,539	20,351
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	1,835	84
Residential Real Estate | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	13,083	0
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	0
Total real estate
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	75,751	46,054
Nonaccrual With Reserve	28,768	0
Loans Past Due Over 90 Days Still Accruing	2,739	2,516
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	6,178	3,423
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	32	79
Commercial & Industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	10,931	9,982
Nonaccrual With Reserve	0	2,534
Loans Past Due Over 90 Days Still Accruing	2,263	1,535
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	993	512
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 0	$ 0

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