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Loans - Allowance for Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for losses | $ 16,614 |  | $ 15,089 |  |  |
Farm & Ranch |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for losses | 3,910 | $ 3,935 | 4,044 | $ 2,112 | $ 2,265 | $ 2,882
Corporate AgFinance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for losses | 3,678 | 7,367 | 2,731 | 2,084 | 1,750 | 560
Agricultural Finance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for losses | 7,588 | 11,302 | 6,775 | 4,196 | 4,015 | 3,442
Rural Infrastructure Finance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for losses | $ 9,026 | $ 5,446 | $ 8,314 | $ 8,806 | $ 8,388 | $ 10,599

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