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Loans Receivable - Summary of Various Categories of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 15,285,972 |  | $ 14,764,500 |  |  |
Allowance for credit losses | (285,649) | $ (281,869) | (275,880) | $ (312,574) | $ (295,856) | $ (288,234)
Loans receivable, net | 15,000,323 |  | 14,488,620 |  |  |
Commercial real estate loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 8,534,990 |  | 8,499,987 |  |  |
Commercial real estate loans | Non-farm/non-residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 5,494,492 |  | 5,426,780 |  |  |
Commercial real estate loans | Construction/land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,709,197 |  | 2,736,214 |  |  |
Allowance for credit losses | (47,413) | (46,741) | (52,271) | (63,398) | (58,673) | (33,877)
Commercial real estate loans | Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 331,301 |  | 336,993 |  |  |
Residential real estate loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | (62,784) | (57,972) | (50,835) | (59,425) | (51,354) | (55,860)
Residential real estate loans | Residential 1-4 family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,142,375 |  | 1,956,489 |  |  |
Residential real estate loans | Multifamily residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 716,595 |  | 496,484 |  |  |
Total real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 11,393,960 |  | 10,952,960 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,233,523 |  | 1,234,361 |  |  |
Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,100,268 |  | 2,022,775 |  |  |
Allowance for credit losses | (61,045) | $ (60,581) | (49,621) | $ (60,603) | $ (69,635) | $ (92,810)
Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 346,167 |  | 367,251 |  |  |
Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 212,054 |  | $ 187,153 |  |  |

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