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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	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 67,055	$ 59,971
Nonaccrual with Reserve	12,171	2,534
Loans Past Due Over 90 Days Still Accruing	12,928	4,130
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,887	13,178
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	9,377	2,177
Commercial real estate loans | Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	15,782	12,094
Nonaccrual with Reserve	9,059	0
Loans Past Due Over 90 Days Still Accruing	603	255
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	414	431
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	0
Residential real estate loans | Residential 1-4 family
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	22,037	20,351
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	543	84
Residential real estate loans | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual		0
Nonaccrual with Reserve		0
Loans Past Due Over 90 Days Still Accruing	0	0
Total real estate
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	51,120	46,054
Nonaccrual with Reserve	9,059	0
Loans Past Due Over 90 Days Still Accruing	10,523	2,516
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	4,639	3,423
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	48	79
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	10,969	9,982
Nonaccrual with Reserve	3,112	2,534
Loans Past Due Over 90 Days Still Accruing	2,311	1,535
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	327	512
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 46	$ 0

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-Topic 326
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