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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	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 78,090	$ 59,971
Nonaccrual with Reserve	2,252	2,534
Loans Past Due Over 90 Days Still Accruing	8,251	4,130
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	35,621	13,178
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	4,387	2,177
Commercial real estate loans | Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	5,516	12,094
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	603	255
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	612	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	23,051	20,351
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	716	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	64,800	46,054
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	5,706	2,516
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	3,908	3,423
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	10	79
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	9,226	9,982
Nonaccrual with Reserve	2,252	2,534
Loans Past Due Over 90 Days Still Accruing	2,463	1,535
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	156	512
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 72	$ 0

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