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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 14,424,728	$ 14,409,480
Accruing Loans Past Due 90 Days or More	4,130	9,845
Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	18,559	21,490
Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,947	6,478
Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	64,101	60,856
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	88,607	88,824
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	14,336,121	14,320,656
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	8,168,157	8,114,140
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,549,954	5,632,063
Accruing Loans Past Due 90 Days or More	2,177	1,844
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	8,124	4,242
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	416	2,117
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	15,355	14,063
Commercial real estate loans | Non-farm/non-residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	23,895	20,422
Commercial real estate loans | Non-farm/non-residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,526,059	5,611,641
Commercial real estate loans | Construction/ Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,293,047	2,135,266
Accruing Loans Past Due 90 Days or More	255	31
Commercial real estate loans | Construction/ Land Development | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,430	4,042
Commercial real estate loans | Construction/ Land Development | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	0	1,892
Commercial real estate loans | Construction/ Land Development | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	12,349	2,008
Commercial real estate loans | Construction/ Land Development | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	13,779	7,942
Commercial real estate loans | Construction/ Land Development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,279,268	2,127,324
Commercial real estate loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	325,156	346,811
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 receivable	474	1,469
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	314	193
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	431	278
Commercial real estate loans | Agricultural | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,219	1,940
Commercial real estate loans | Agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	323,937	344,871
Residential Real Estate | Residential 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,844,260	1,748,551
Accruing Loans Past Due 90 Days or More	84	1,374
Residential Real Estate | Residential 1-4 family | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	4,346	6,715
Residential Real Estate | Residential 1-4 family | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,423	605
Residential Real Estate | Residential 1-4 family | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	20,435	19,457
Residential Real Estate | Residential 1-4 family | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	26,204	26,777
Residential Real Estate | Residential 1-4 family | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,818,056	1,721,774
Residential Real Estate | Multifamily residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	435,736	578,052
Accruing Loans Past Due 90 Days or More	0	0
Residential Real Estate | Multifamily residential | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	0	0
Residential Real Estate | Multifamily residential | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	0	0
Residential Real Estate | Multifamily residential | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	0	0
Residential Real Estate | Multifamily residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	0	0
Residential Real Estate | Multifamily residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	435,736	578,052
Total real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	10,448,153	10,440,743
Accruing Loans Past Due 90 Days or More	2,516	3,249
Total real estate | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	14,374	16,468
Total real estate | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,153	4,807
Total real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	48,570	35,806
Total real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	65,097	57,081
Total real estate | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	10,383,056	10,383,662
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,153,690	1,149,896
Accruing Loans Past Due 90 Days or More	79	35
Consumer | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,022	950
Consumer | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	303	539
Consumer | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,502	2,877
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	4,827	4,366
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,148,863	1,145,530
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,324,991	2,349,263
Accruing Loans Past Due 90 Days or More	1,535	6,300
Commercial & Industrial | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,089	3,007
Commercial & Industrial | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,378	1,075
Commercial & Industrial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	11,517	21,220
Commercial & Industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	16,984	25,302
Commercial & Industrial | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,308,007	2,323,961
Agricultural & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	497,894	469,578
Accruing Loans Past Due 90 Days or More	0	261
Agricultural & other | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,074	1,065
Agricultural & other | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	113	57
Agricultural & other | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	512	953
Agricultural & other | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,699	2,075
Agricultural & other | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 496,195	$ 467,503

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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