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Related Party Transactions - Other Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 1.2 | $ 1.1 | $ 1.0
Farm & Ranch [Member] | Mortgages [Member] | First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 28.5 | 24.7 | 21.1
Guarantee Obligations [Member] | First Dakota Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 0.4 | 0.0 | 7.8
USDA Securities [Member] | USDA Guarantee [Member] | Bath State Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 5.4 | 1.3 | $ 2.1
Floating Interest Rate [Member] | Subordinated Debt [Member] | CoBank, ACB [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Notes Receivable, Related Parties |  | $ 70.0 |
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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- Definition For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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