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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	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 59,971	$ 51,011
Nonaccrual With Reserve	2,534	8,383
Loans Past Due Over 90 Days Still Accruing	4,130	9,845
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	13,178	12,219
Nonaccrual With Reserve	0	8,383
Loans Past Due Over 90 Days Still Accruing	2,177	1,844
Commercial real estate loans | Construction/ Land Development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,094	1,977
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	255	31
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	431	278
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	0
Residential Real Estate | Residential 1-4 family
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	20,351	18,083
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	84	1,374
Residential Real Estate | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	0	0
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	46,054	32,557
Nonaccrual With Reserve	0	8,383
Loans Past Due Over 90 Days Still Accruing	2,516	3,249
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	3,423	2,842
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	79	35
Commercial & Industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	9,982	14,920
Nonaccrual With Reserve	2,534	0
Loans Past Due Over 90 Days Still Accruing	1,535	6,300
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	512	692
Nonaccrual With Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 0	$ 261

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-Topic 326
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