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Loans Receivable - Summary of Various Categories of Loans Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 14,513,673 | $ 14,424,728 |  |
Allowance for credit losses | (290,294) | (288,234) | $ (287,169) | $ (289,669)
Loans receivable, net | 14,223,379 | 14,136,494 |  |
Commercial real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 8,285,138 | 8,168,157 |  |
Commercial real estate loans | Non-farm/non-residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 5,616,965 | 5,549,954 |  |
Commercial real estate loans | Construction/land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,330,555 | 2,293,047 |  |
Allowance for credit losses | (35,921) | (33,877) | (31,172) | (32,243)
Commercial real estate loans | Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 337,618 | 325,156 |  |
Residential real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | (56,903) | (55,860) | (51,433) | (50,963)
Residential real estate loans | Residential 1-4 family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,899,974 | 1,844,260 |  |
Residential real estate loans | Multifamily residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 415,926 | 435,736 |  |
Total real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 10,601,038 | 10,448,153 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,163,228 | 1,153,690 |  |
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,284,775 | 2,324,991 |  |
Allowance for credit losses | (91,008) | (92,810) | $ (92,396) | $ (89,354)
Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 278,609 | 307,327 |  |
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 186,023 | $ 190,567 |  |

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