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Summary of Significant Accounting Policies - CECL Adoption (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loans receivable |  |  | $ 12,618 |  |
Long-term standby purchase commitments and guarantees | $ 3,277 |  | 2,164 |  |
Transition Adjustment | 13,832 |  | 10,454 |  |
Investment Securities |  |  | 0 |  |
Retained earnings | 992,477 |  | 799,276 | $ 752,557 | $ 708,644
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Transition Adjustment |  | $ 2,656 |  |  |
Investment Securities |  | 9 |  |  |
Retained earnings |  |  | (2,099) |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Transition Adjustment |  | 15,274 |  |  |
Investment Securities |  | 9 |  |  |
Retained earnings |  |  | 797,177 |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings | 509,560 |  | 457,047 | 393,351 | 323,175
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  | (2,099) |  |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  | 454,948 | 454,948 |  |
Farm & Ranch |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loans receivable |  |  | 10,454 |  |
Long-term standby purchase commitments and guarantees | 2,097 | 2,016 | 2,164 | 2,167 | 2,070
Transition Adjustment | 3,745 |  | 10,454 | 7,017 | 6,796
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Long-term standby purchase commitments and guarantees |  | (148) | (148) |  |
Transition Adjustment |  | (3,909) | (3,909) |  |
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Long-term standby purchase commitments and guarantees |  | 2,016 |  |  |
Transition Adjustment |  | 6,545 | 6,545 |  |
Rural Utilities: |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loans receivable |  |  | 0 |  |
Long-term standby purchase commitments and guarantees | 1,180 | 1,011 | 0 | 0 | 0
Transition Adjustment | $ 10,087 |  | 0 | $ 0 | $ 0
Rural Utilities: | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Long-term standby purchase commitments and guarantees |  | 1,011 | 1,011 |  |
Transition Adjustment |  | 5,378 | 5,378 |  |
Rural Utilities: | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Long-term standby purchase commitments and guarantees |  | 1,011 |  |  |
Transition Adjustment |  | 5,378 | 5,378 |  |
AgVantage Securities |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for loans receivable |  |  | $ 0 |  |
AgVantage Securities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Transition Adjustment |  | 315 |  |  |
AgVantage Securities | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Transition Adjustment |  | $ 315 |  |  |

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