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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 14,513,673	$ 14,424,728
Accruing Loans Past Due 90 Days or More	12,928	4,130
Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	18,037	18,559
Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,974	5,947
Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	79,983	64,101
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	103,994	88,607
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	14,409,679	14,336,121
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,285,138	8,168,157
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,616,965	5,549,954
Accruing Loans Past Due 90 Days or More	9,377	2,177
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,628	8,124
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,148	416
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	22,264	15,355
Commercial real estate loans | Non-farm/non-residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	26,040	23,895
Commercial real estate loans | Non-farm/non-residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,590,925	5,526,059
Commercial real estate loans | Construction/land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,330,555	2,293,047
Accruing Loans Past Due 90 Days or More	603	255
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,525	1,430
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	103	0
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,385	12,349
Commercial real estate loans | Construction/land development | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	18,013	13,779
Commercial real estate loans | Construction/land development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,312,542	2,279,268
Commercial real estate loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	337,618	325,156
Accruing Loans Past Due 90 Days or More	0	0
Commercial real estate loans | Agricultural | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	301	474
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	311	314
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	414	431
Commercial real estate loans | Agricultural | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,026	1,219
Commercial real estate loans | Agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	336,592	323,937
Residential real estate loans | Residential 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,899,974	1,844,260
Accruing Loans Past Due 90 Days or More	543	84
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,488	4,346
Residential real estate loans | Residential 1-4 family | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,466	1,423
Residential real estate loans | Residential 1-4 family | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	22,580	20,435
Residential real estate loans | Residential 1-4 family | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	34,534	26,204
Residential real estate loans | Residential 1-4 family | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,865,440	1,818,056
Residential real estate loans | Multifamily residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	415,926	435,736
Accruing Loans Past Due 90 Days or More	0	0
Residential real estate loans | Multifamily residential | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	790	0
Residential real estate loans | Multifamily residential | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate loans | Multifamily residential | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate loans | Multifamily residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	790	0
Residential real estate loans | Multifamily residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	415,136	435,736
Total real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,601,038	10,448,153
Accruing Loans Past Due 90 Days or More	10,523	2,516
Total real estate | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,732	14,374
Total real estate | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,028	2,153
Total real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	61,643	48,570
Total real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	80,403	65,097
Total real estate | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,520,635	10,383,056
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,163,228	1,153,690
Accruing Loans Past Due 90 Days or More	48	79
Consumer | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	417	1,022
Consumer | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	151	303
Consumer | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,687	3,502
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,255	4,827
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,157,973	1,148,863
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,284,775	2,324,991
Accruing Loans Past Due 90 Days or More	2,311	1,535
Commercial and industrial | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,426	2,089
Commercial and industrial | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,747	3,378
Commercial and industrial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	13,280	11,517
Commercial and industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	17,453	16,984
Commercial and industrial | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,267,322	2,308,007
Agricultural & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	464,632	497,894
Accruing Loans Past Due 90 Days or More	46	0
Agricultural & other | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	462	1,074
Agricultural & other | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	48	113
Agricultural & other | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	373	512
Agricultural & other | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	883	1,699
Agricultural & other | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 463,749	$ 496,195

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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- Definition

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