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Loans Receivable - Summary of Various Categories of Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 14,764,500 | $ 14,424,728 |  |
Allowance for credit losses | (275,880) | (288,234) | $ (289,669) | $ (236,714)
Loans receivable, net | 14,488,620 | 14,136,494 |  |
Commercial real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 8,499,987 | 8,168,157 |  |
Commercial real estate loans | Non-farm/non-residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 5,426,780 | 5,549,954 |  |
Commercial real estate loans | Construction/ Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,736,214 | 2,293,047 |  |
Allowance for credit losses | (52,271) | (33,877) | (32,243) | (28,415)
Commercial real estate loans | Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 336,993 | 325,156 |  |
Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | (50,835) | (55,860) | (50,963) | (48,458)
Residential Real Estate | Residential 1-4 family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,956,489 | 1,844,260 |  |
Residential Real Estate | Multifamily residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 496,484 | 435,736 |  |
Total real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 10,952,960 | 10,448,153 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,234,361 | 1,153,690 |  |
Commercial & Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,022,775 | 2,324,991 |  |
Allowance for credit losses | (49,621) | (92,810) | $ (89,354) | $ (53,062)
Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 367,251 | 307,327 |  |
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 187,153 | $ 190,567 |  |

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