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Related Party Transactions - Other Related Party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 1,100 | $ 1,000 | $ 800
AgGeorgia [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties |  |  | 100
Mortgages [Member] | Farm & Ranch [Member] | First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 24,700 | 21,100 | 35,100
Guarantee Obligations [Member] | First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 0 | 7,800 | 0
Guarantee Obligations [Member] | AgGeorgia [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party |  |  | 20,200
USDA Securities [Member] | USDA Guarantee [Member] | Bath State Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 1,300 | 2,100 | $ 4,500
Floating Interest Rate [Member] | Subordinated Debt [Member] | CoBank, ACB [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Notes Receivable, Related Parties | $ 70,000 | $ 70,000 |
Common Class B, Voting [Member] | CoBank, ACB [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Common Stock Ownership Percentage by a Related Party |  | 32.60% |

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