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Loans Receivable - Summary of Various Categories of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 14,823,979 |  | $ 14,424,728 |  |  |
Allowance for credit losses | (312,574) | $ (295,856) | (288,234) | $ (285,562) | $ (285,683) | $ (289,669)
Loans receivable, net | 14,511,405 |  | 14,136,494 |  |  |
Commercial real estate loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 8,573,920 |  | 8,168,157 |  |  |
Commercial real estate loans | Non-farm/non-residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 5,496,536 |  | 5,549,954 |  |  |
Commercial real estate loans | Construction/land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,741,419 |  | 2,293,047 |  |  |
Allowance for credit losses | (63,398) | (58,673) | (33,877) | (32,642) | (32,275) | (32,243)
Commercial real estate loans | Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 335,965 |  | 325,156 |  |  |
Residential real estate loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | (59,425) | (51,354) | (55,860) | (54,884) | (51,732) | (50,963)
Residential real estate loans | Residential 1-4 family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,932,352 |  | 1,844,260 |  |  |
Residential real estate loans | Multifamily residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 482,648 |  | 435,736 |  |  |
Total real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 10,988,920 |  | 10,448,153 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,219,197 |  | 1,153,690 |  |  |
Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,084,667 |  | 2,324,991 |  |  |
Allowance for credit losses | (60,603) | $ (69,635) | (92,810) | $ (92,469) | $ (90,474) | $ (89,354)
Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 352,963 |  | 307,327 |  |  |
Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 178,232 |  | $ 190,567 |  |  |

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