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Related Party Transactions - Other Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 1.4 | $ 1.2 | $ 1.1
Farm & Ranch [Member] | Mortgages [Member] | First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 39.5 | 28.5 | 24.7
Guarantee Obligations [Member] | First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 3.0 | 0.4 | 0.0
USDA Securities [Member] | USDA Guarantee [Member] | Bath State Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 2.0 | $ 5.4 | 1.3
Floating Interest Rate [Member] | Subordinated Debt [Member] | CoBank, ACB [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Notes Receivable, Related Parties |  |  | $ 70.0
Common Class B [Member] | CoBank, ACB [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Common Stock Ownership Percentage by a Related Party | 32.60% |  |

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