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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, 2025	Dec. 31, 2024
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 86,383	$ 93,853
Nonaccrual with Reserve	28,358	28,768
Loans Past Due Over 90 Days Still Accruing	3,264	5,034
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	32,953	35,868
Nonaccrual with Reserve	28,358	28,768
Loans Past Due Over 90 Days Still Accruing	226	304
Commercial real estate loans | Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	2,061	3,702
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	600
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	538	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	23,510	22,539
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	306	1,835
Residential real estate loans | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	13,075	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	72,137	75,751
Nonaccrual with Reserve	28,358	28,768
Loans Past Due Over 90 Days Still Accruing	532	2,739
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	6,014	6,178
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	11	32
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	7,619	10,931
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	2,380	2,263
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	613	993
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 341	$ 0

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