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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, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 14,952,116	$ 14,764,500
Accruing Loans Past Due 90 Days or More	3,264	5,034
Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	23,029	15,145
Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,860	46,050
Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	89,647	98,887
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	119,536	160,082
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	14,832,580	14,604,418
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,659,878	8,499,987
Commercial real estate loans | Non-farm/non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,588,681	5,426,780
Accruing Loans Past Due 90 Days or More	226	304
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,346	4,352
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,018	38,944
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	33,179	36,172
Commercial real estate loans | Non-farm/non-residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	37,543	79,468
Commercial real estate loans | Non-farm/non-residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,551,138	5,347,312
Commercial real estate loans | Construction/land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,735,760	2,736,214
Accruing Loans Past Due 90 Days or More	0	600
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,259	369
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16	799
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,061	4,302
Commercial real estate loans | Construction/land development | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,336	5,470
Commercial real estate loans | Construction/land development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,731,424	2,730,744
Commercial real estate loans | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	335,437	336,993
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	39	90
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	21	43
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	538	559
Commercial real estate loans | Agricultural | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	598	692
Commercial real estate loans | Agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	334,839	336,301
Residential real estate loans | Residential 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,947,872	1,956,489
Accruing Loans Past Due 90 Days or More	306	1,835
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,129	1,897
Residential real estate loans | Residential 1-4 family | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,096	4,877
Residential real estate loans | Residential 1-4 family | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	23,816	24,374
Residential real estate loans | Residential 1-4 family | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	34,041	31,148
Residential real estate loans | Residential 1-4 family | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,913,831	1,925,341
Residential real estate loans | Multifamily residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	576,089	496,484
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	0	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	13,075	13,083
Residential real estate loans | Multifamily residential | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	13,075	13,083
Residential real estate loans | Multifamily residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	563,014	483,401
Total real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	11,183,839	10,952,960
Accruing Loans Past Due 90 Days or More	532	2,739
Total real estate | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,773	6,708
Total real estate | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,151	44,663
Total real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	72,669	78,490
Total real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	89,593	129,861
Total real estate | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	11,094,246	10,823,099
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,227,745	1,234,361
Accruing Loans Past Due 90 Days or More	11	32
Consumer | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,024	7,046
Consumer | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,471	68
Consumer | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,025	6,210
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,520	13,324
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,212,225	1,221,037
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,045,036	2,022,775
Accruing Loans Past Due 90 Days or More	2,380	2,263
Commercial and industrial | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,125	309
Commercial and industrial | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	206	1,028
Commercial and industrial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	9,999	13,194
Commercial and industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,330	14,531
Commercial and industrial | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,032,706	2,008,244
Agricultural & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	495,496	554,404
Accruing Loans Past Due 90 Days or More	341	0
Agricultural & other | Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,107	1,082
Agricultural & other | Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	32	291
Agricultural & other | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	954	993
Agricultural & other | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,093	2,366
Agricultural & other | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 493,403	$ 552,038

X

- Definition

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

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