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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, 2025	Dec. 31, 2024
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 89,261	$ 93,853
Nonaccrual with Reserve	32,934	28,768
Loans Past Due Over 90 Days Still Accruing	7,031	5,034
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	34,317	35,868
Nonaccrual with Reserve	27,953	28,768
Loans Past Due Over 90 Days Still Accruing	1,657	304
Commercial real estate loans | Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	1,553	3,702
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	209	600
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	519	559
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	22,372	22,539
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	3,459	1,835
Residential real estate loans | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	13,468	13,083
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	72,229	75,751
Nonaccrual with Reserve	27,953	28,768
Loans Past Due Over 90 Days Still Accruing	5,325	2,739
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,042	6,178
Nonaccrual with Reserve	4,981	0
Loans Past Due Over 90 Days Still Accruing	34	32
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	4,030	10,931
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	1,672	2,263
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	960	993
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 0	$ 0

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