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Loans - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale, at lower of cost or fair value | $ 0 |  | $ 0 |  | $ 0
Release of losses | (761,000) | $ 451,000 | 152,000 | $ 3,889,000 |
Real estate owned, amount of loss at acquisition |  | 400,000 |  |  |
Rural Utilities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Release of losses | (181,000) | 1,397,000 | 821,000 | 3,522,000 |
Increase (decrease) in loan volume |  | 311,800,000 |  |  |
Farm & Ranch |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Release of losses | $ (626,000) | $ (920,000) | $ (653,000) | (112,000) |
Rural Utilities and Farm & Ranch |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Release of losses |  |  |  | $ 3,400,000 |

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