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Loans - Allowance for Losses Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Loans | $ 15,821 |  | $ 15,821 |  |  |  | $ 10,454 |  |
(Release of)/provision for losses | 653 | $ 760 | 4,542 | $ 1,074 |  |  |  |  |
Current period charge-offs |  |  | 100 |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  | $ 2,656 |  |  |
Farm & Ranch |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Loans | 5,739 | 8,024 | 5,739 | 8,024 | $ 6,039 |  | 10,454 | $ 7,264 | $ 7,017
(Release of)/provision for losses | (300) | 760 | (412) | 1,074 |  |  |  |  |
Current period charge-offs | 0 |  | 394 |  |  |  |  |  |
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Loans |  |  |  |  | 0 | (3,909) | (3,909) | 0 | 0
Rural Utilities |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Loans | 10,082 | 0 | 10,082 | 0 | 8,900 |  | 0 | 0 | 0
(Release of)/provision for losses | 1,182 | $ 0 | 4,704 | $ 0 |  |  |  |  |
Current period charge-offs | 0 |  | 0 |  |  |  |  |  |
Rural Utilities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Loans |  |  |  |  | $ 0 | $ 5,378 | $ 5,378 | $ 0 | $ 0
Farm & Ranch and Rural Utilities |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
(Release of)/provision for losses | $ 900 |  | $ 4,300 |  |  |  |  |  |

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