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Summary of Significant Accounting Policies - CECL Adoption (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |
Allowance for loans receivable |  | $ 12,618 |  |  |  |  |  |  |  |
Long-term standby purchase commitments and guarantees | $ 3,568 | 2,164 |  |  |  |  |  |  |  |
Transition Adjustment | 15,821 | 10,454 |  |  |  |  |  |  |  |
Investment Securities |  | 0 |  |  |  |  |  |  |  |
Retained earnings | 930,345 | 799,276 | $ 824,116 | $ 693,617 |  | $ 750,259 | $ 773,742 | $ 763,298 |  | $ 752,557
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 | $ 488,717 | 457,047 | 478,647 | $ 455,545 |  | 435,479 | 428,569 | $ 407,755 |  | 393,351
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Retained earnings |  | (2,099) |  |  | (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] |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |
Allowance for loans receivable |  | 10,454 |  |  |  |  |  |  |  |
Long-term standby purchase commitments and guarantees | $ 2,278 | 2,164 | 1,650 |  | 2,016 | 1,743 | 1,880 |  | $ 2,167 | 2,167
Transition Adjustment | $ 5,739 | 10,454 | 6,039 |  |  | 8,024 | 7,264 |  |  | 7,017
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 |  |  | 0 |  | (148) |  | 0 |  | 0 |
Transition Adjustment |  | (3,909) | 0 |  | (3,909) |  | 0 |  |  | 0
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 | 6,039 |  | 6,545 |  | 7,264 |  |  | 7,017
Rural Utilities |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |
Allowance for loans receivable |  | 0 |  |  |  |  |  |  |  |
Long-term standby purchase commitments and guarantees | $ 1,290 | 0 | 1,370 |  | 1,011 | 0 | 0 |  | 0 | 0
Transition Adjustment | $ 10,082 | 0 | 8,900 |  |  | $ 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 |  |  | 0 |  | 1,011 |  | 0 |  | $ 0 |
Transition Adjustment |  | 5,378 | 0 |  | 5,378 |  | 0 |  |  | 0
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 | $ 8,900 |  | 5,378 |  | $ 0 |  |  | $ 0
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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