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Loans Receivable - Summary of Various Categories of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 14,952,116 | $ 14,764,500 |  |
Allowance for credit losses | (279,944) | (275,880) | $ (290,294) | $ (288,234)
Loans receivable, net | 14,672,172 | 14,488,620 |  |
Commercial real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 8,659,878 | 8,499,987 |  |
Commercial real estate loans | Non-farm/non-residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 5,588,681 | 5,426,780 |  |
Commercial real estate loans | Construction/land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,735,760 | 2,736,214 |  |
Allowance for credit losses | (48,176) | (52,271) | (35,921) | (33,877)
Commercial real estate loans | Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 335,437 | 336,993 |  |
Residential real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | (53,408) | (50,835) | (56,903) | (55,860)
Residential real estate loans | Residential 1-4 family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,947,872 | 1,956,489 |  |
Residential real estate loans | Multifamily residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 576,089 | 496,484 |  |
Total real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 11,183,839 | 10,952,960 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,227,745 | 1,234,361 |  |
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,045,036 | 2,022,775 |  |
Allowance for credit losses | (60,122) | (49,621) | $ (91,008) | $ (92,810)
Agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 314,323 | 367,251 |  |
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 181,173 | $ 187,153 |  |

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