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Summary of Significant Accounting Policies - CECL Adoption (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2020 | Jan. 01, 2020 | 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 |  |  |  |  |  |  |
Total Allowance |  | $ 12,618 |  |  |  |  |  |
Long-term standby purchase commitments and guarantees | $ 3,020 | 2,164 |  |  |  |  |  |
Securities borrowed, allowance for credit loss |  | 0 |  |  |  |  |  |
Retained earnings | 824,116 | 799,276 | $ 693,617 |  | $ 773,742 | $ 763,298 |  | $ 752,557
Allowance for losses | 14,939 | 10,454 |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Securities borrowed, allowance for credit loss |  |  |  | $ 9 |  |  |  |
Retained earnings |  | (2,099) |  |  |  |  |  |
Allowance for losses |  |  |  | 2,656 |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Securities borrowed, allowance for credit loss |  |  |  | 9 |  |  |  |
Retained earnings |  | 797,177 |  |  |  |  |  |
Allowance for losses |  |  |  | 15,274 |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Retained earnings | 478,647 | 457,047 | 455,545 |  | 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 |  |  |  |  |  |
Total Allowance |  | $ 10,454 |  |  |  |  |  |
Long-term standby purchase commitments and guarantees | 1,650 | 2,164 | 2,020 | 2,016 | 1,880 | 2,038 | $ 2,167 | 2,167
Allowance for losses | 6,039 | 10,454 | 7,353 |  |  |  |  |
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 |
Allowance for losses |  | (3,909) | 0 | (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 |  |  |  |
Allowance for losses |  | $ 6,545 | 7,353 | 6,545 |  |  |  |
Rural Utilities |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Total Allowance |  | $ 0 |  |  |  |  |  |
Long-term standby purchase commitments and guarantees | 1,370 | 0 | 1,400 | 1,011 | $ 0 | 0 | 0 | $ 0
Allowance for losses | $ 8,900 | 0 | 7,503 |  |  |  |  |
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 |
Allowance for losses |  | 5,378 | 0 | 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 |  |  |  |
Allowance for losses |  | 5,378 | $ 7,503 | 5,378 |  |  |  |
Institutional Credit |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Total Allowance |  | $ 0 |  |  |  |  |  |
Institutional Credit | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Allowance for losses |  |  |  | 315 |  |  |  |
Institutional Credit | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Allowance for losses |  |  |  | $ 315 |  |  |  |

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