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Guarantees (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Guarantor Obligations [Line Items] |  |  |
Term of guarantees, minimum | 1 year |  |
Term of guarantees maximum | 30 years |  |
Rental expense | $ 2,000,000.0 |  |
Rental expense |  | $ 2,000,000.0 | $ 1,600,000
Farm & Ranch Loans and USDA Guarantees |  |  |
Guarantor Obligations [Line Items] |  |  |
Commitments to purchase Farm & Ranch loans and USDA Guarantees | 65,100,000 | $ 37,100,000 |
Rural Utilities Loans |  |  |
Guarantor Obligations [Line Items] |  |  |
Commitments to purchase Farm & Ranch loans and USDA Guarantees | $ 0 |  |

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