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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 14,781,457	$ 14,424,728
Accruing Loans Past Due 90 Days or More	8,251	4,130
Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	43,204	18,559
Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,289	5,947
Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	86,341	64,101
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	135,834	88,607
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	14,645,623	14,336,121
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,457,203	8,168,157
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,599,925	5,549,954
Accruing Loans Past Due 90 Days or More	4,387	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	3,136	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	1,268	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	40,008	15,355
Commercial real estate loans | Non-farm/non-residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	44,412	23,895
Commercial real estate loans | Non-farm/non-residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,555,513	5,526,059
Commercial real estate loans | Construction/land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,511,817	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	237	1,430
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	499	0
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,119	12,349
Commercial real estate loans | Construction/land development | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,855	13,779
Commercial real estate loans | Construction/land development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,504,962	2,279,268
Commercial real estate loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	345,461	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	352	474
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	314
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	612	431
Commercial real estate loans | Agricultural | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	964	1,219
Commercial real estate loans | Agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	344,497	323,937
Residential real estate loans | Residential 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,910,143	1,844,260
Accruing Loans Past Due 90 Days or More	716	84
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,207	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	2,556	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	23,767	20,435
Residential real estate loans | Residential 1-4 family | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	33,530	26,204
Residential real estate loans | Residential 1-4 family | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,876,613	1,818,056
Residential real estate loans | Multifamily residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	509,091	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	20,893	0
Residential real estate loans | Multifamily residential | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	150	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	21,043	0
Residential real estate loans | Multifamily residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	488,048	435,736
Total real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,876,437	10,448,153
Accruing Loans Past Due 90 Days or More	5,706	2,516
Total real estate | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	31,825	14,374
Total real estate | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,473	2,153
Total real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	70,506	48,570
Total real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	106,804	65,097
Total real estate | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	10,769,633	10,383,056
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,189,386	1,153,690
Accruing Loans Past Due 90 Days or More	10	79
Consumer | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,426	1,022
Consumer | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,370	303
Consumer | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,918	3,502
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	11,714	4,827
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,177,672	1,148,863
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,242,072	2,324,991
Accruing Loans Past Due 90 Days or More	2,463	1,535
Commercial and industrial | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,622	2,089
Commercial and industrial | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	413	3,378
Commercial and industrial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	11,689	11,517
Commercial and industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,724	16,984
Commercial and industrial | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,226,348	2,308,007
Agricultural & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	473,562	497,894
Accruing Loans Past Due 90 Days or More	72	0
Agricultural & other | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,331	1,074
Agricultural & other | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	33	113
Agricultural & other | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	228	512
Agricultural & other | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,592	1,699
Agricultural & other | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 471,970	$ 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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