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Loans Receivable - Summary of Various Categories of Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 14,424,728 | $ 14,409,480 |  |
Allowance for credit losses | (288,234) | (289,669) | $ (236,714) | $ (245,473)
Loans receivable, net | 14,136,494 | 14,119,811 |  |
Commercial real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 8,168,157 | 8,114,140 |  |
Commercial real estate loans | Non-farm/non-residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 5,549,954 | 5,632,063 |  |
Commercial real estate loans | Construction/ Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,293,047 | 2,135,266 |  |
Allowance for credit losses | (33,877) | (32,243) | (28,415) | (32,861)
Commercial real estate loans | Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 325,156 | 346,811 |  |
Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | (55,860) | (50,963) | (48,458) | (53,216)
Residential Real Estate | Residential 1-4 family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,844,260 | 1,748,551 |  |
Residential Real Estate | Multifamily residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 435,736 | 578,052 |  |
Total real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 10,448,153 | 10,440,743 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,153,690 | 1,149,896 |  |
Commercial & Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,324,991 | 2,349,263 |  |
Allowance for credit losses | (92,810) | (89,354) | $ (53,062) | $ (46,530)
Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 307,327 | 285,235 |  |
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 190,567 | $ 184,343 |  |

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