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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Past Due (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | $ 1,447,529 | $ 1,411,784
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 1,430,896 | 1,393,274
Current | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 5,130 |
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 1,831 | 10,816
30-59 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 375 | 595
60-89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 971 | $ 246
Greater Than 89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Commercial real estate | Current | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 4,826 |
Commercial real estate | 30-59 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Commercial real estate | 60-89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Commercial real estate | Greater Than 89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Agricultural operating | Current | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 179 |
Agricultural operating | 30-59 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans |  |
Agricultural operating | 60-89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans |  |
Agricultural operating | Greater Than 89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans |  |
Residential mortgage | Current | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 105 |
Residential mortgage | 30-59 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Residential mortgage | 60-89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Residential mortgage | Greater Than 89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Other consumer | Current | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 20 |
Other consumer | 30-59 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Other consumer | 60-89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | 0 |
Other consumer | Greater Than 89 Days Past Due | Entity Loan Modification Program |  |
Financing Receivable, Past Due [Line Items] |  |
Total allowance for credit losses on loans | $ 0 |

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