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Accounting Policies - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | $ 1,483,135 | $ 1,399,827
Debt securities of consolidated trusts held by third parties | 1,486,733 | 1,404,945
Farm & Ranch [Member] |  |
Variable Interest Entity [Line Items] |  |
Other Liabilities | 3,600 | 5,100
USDA Guarantees [Member] |  |
Variable Interest Entity [Line Items] |  |
Unamortized Premium/(Discount) | 300 | 300
On-balance sheet [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 1,483,135 | 1,399,827
Debt securities of consolidated trusts held by third parties | 1,486,733 | 1,404,945
On-balance sheet [Member] | Farm & Ranch [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 1,483,135 | 1,399,827
Debt securities of consolidated trusts held by third parties | 1,486,733 | 1,404,945
On-balance sheet [Member] | USDA Guarantees [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 0 | 0
Debt securities of consolidated trusts held by third parties | 0 | 0
On-balance sheet [Member] | Rural Utilities [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 0 | 0
Debt securities of consolidated trusts held by third parties | 0 | 0
On-balance sheet [Member] | Institutional Credit [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 0 | 0
Debt securities of consolidated trusts held by third parties | 0 | 0
On-balance sheet [Member] | Corporate Segment [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 0 | 0
Debt securities of consolidated trusts held by third parties | 0 | 0
Off-balance sheet [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 634,283 | 587,728
Off-balance sheet [Member] | Farm & Ranch [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 287,594 | 333,511
Off-balance sheet [Member] | USDA Guarantees [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 346,689 | 254,217
Off-balance sheet [Member] | Rural Utilities [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Off-balance sheet [Member] | Institutional Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Off-balance sheet [Member] | Corporate Segment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Farmer Mac Guaranteed Securities: | On-balance sheet [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 28,117 | 30,300
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 27,861 | 29,980
Farmer Mac Guaranteed Securities: | On-balance sheet [Member] | Farm & Ranch [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Farmer Mac Guaranteed Securities: | On-balance sheet [Member] | USDA Guarantees [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 28,117 | 30,300
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 27,861 | 29,980
Farmer Mac Guaranteed Securities: | On-balance sheet [Member] | Rural Utilities [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Farmer Mac Guaranteed Securities: | On-balance sheet [Member] | Institutional Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Farmer Mac Guaranteed Securities: | On-balance sheet [Member] | Corporate Segment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Investment Securities [Member] |  |
Variable Interest Entity [Line Items] |  |
Unamortized Premium/(Discount) | (2,558) | 2,365
Investment Securities [Member] | On-balance sheet [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 924,099 | 783,964
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 924,494 | 783,916
Investment Securities [Member] | On-balance sheet [Member] | Farm & Ranch [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Investment Securities [Member] | On-balance sheet [Member] | USDA Guarantees [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Investment Securities [Member] | On-balance sheet [Member] | Rural Utilities [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Investment Securities [Member] | On-balance sheet [Member] | Institutional Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0
Investment Securities [Member] | On-balance sheet [Member] | Corporate Segment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 924,099 | 783,964
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 924,494 | $ 783,916

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