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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	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 95,747	$ 59,971
Nonaccrual with Reserve	46,527	2,534
Loans Past Due Over 90 Days Still Accruing	5,356	4,130
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	48,086	13,178
Nonaccrual with Reserve	42,025	0
Loans Past Due Over 90 Days Still Accruing	709	2,177
Commercial real estate loans | Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	5,403	12,094
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	657	255
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	737	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	23,905	20,351
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	1,495	84
Residential real estate loans | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	592
Nonaccrual with Reserve	0
Loans Past Due Over 90 Days Still Accruing	0	0
Total real estate
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	78,723	46,054
Nonaccrual with Reserve	42,025	0
Loans Past Due Over 90 Days Still Accruing	2,861	2,516
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	7,501	3,423
Nonaccrual with Reserve	2,340	0
Loans Past Due Over 90 Days Still Accruing	28	79
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	8,511	9,982
Nonaccrual with Reserve	2,162	2,534
Loans Past Due Over 90 Days Still Accruing	2,405	1,535
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	1,012	512
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 62	$ 0

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