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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 14,823,979	$ 14,424,728
Accruing Loans Past Due 90 Days or More	5,356	4,130
Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	33,696	18,559
Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,767	5,947
Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	101,103	64,101
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	143,566	88,607
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	14,680,413	14,336,121
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,573,920	8,168,157
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,496,536	5,549,954
Accruing Loans Past Due 90 Days or More	709	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	4,391	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	837	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	48,795	15,355
Commercial real estate loans | Non-farm/non-residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	54,023	23,895
Commercial real estate loans | Non-farm/non-residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,442,513	5,526,059
Commercial real estate loans | Construction/land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,741,419	2,293,047
Accruing Loans Past Due 90 Days or More	657	255
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	778	1,430
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	221	0
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,060	12,349
Commercial real estate loans | Construction/land development | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,059	13,779
Commercial real estate loans | Construction/land development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,734,360	2,279,268
Commercial real estate loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	335,965	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	177	474
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	198	314
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	737	431
Commercial real estate loans | Agricultural | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,112	1,219
Commercial real estate loans | Agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	334,853	323,937
Residential real estate loans | Residential 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,932,352	1,844,260
Accruing Loans Past Due 90 Days or More	1,495	84
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,329	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	6,698	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	25,400	20,435
Residential real estate loans | Residential 1-4 family | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	34,427	26,204
Residential real estate loans | Residential 1-4 family | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,897,925	1,818,056
Residential real estate loans | Multifamily residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	482,648	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	20,902	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	592	0
Residential real estate loans | Multifamily residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	21,494	0
Residential real estate loans | Multifamily residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	461,154	435,736
Total real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,988,920	10,448,153
Accruing Loans Past Due 90 Days or More	2,861	2,516
Total real estate | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	28,577	14,374
Total real estate | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,954	2,153
Total real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	81,584	48,570
Total real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	118,115	65,097
Total real estate | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,870,805	10,383,056
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,219,197	1,153,690
Accruing Loans Past Due 90 Days or More	28	79
Consumer | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,928	1,022
Consumer | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	155	303
Consumer | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,529	3,502
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,612	4,827
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,208,585	1,148,863
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,084,667	2,324,991
Accruing Loans Past Due 90 Days or More	2,405	1,535
Commercial and industrial | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,071	2,089
Commercial and industrial | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	567	3,378
Commercial and industrial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,916	11,517
Commercial and industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,554	16,984
Commercial and industrial | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,072,113	2,308,007
Agricultural & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	531,195	497,894
Accruing Loans Past Due 90 Days or More	62	0
Agricultural & other | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,120	1,074
Agricultural & other | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	91	113
Agricultural & other | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,074	512
Agricultural & other | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,285	1,699
Agricultural & other | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 528,910	$ 496,195

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- Definition

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

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