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Accounting Policies - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | $ 1,132,966 | $ 708,111
Debt securities of consolidated trusts held by third parties | 1,142,704 | 713,536
Farm & Ranch [Member] |  |
Variable Interest Entity [Line Items] |  |
Other Liabilities | 9,700 | 5,400
USDA Guarantees [Member] |  |
Variable Interest Entity [Line Items] |  |
Unamortized Premium/(Discount) | 400 | (200)
Institutional Credit [Member] |  |
Variable Interest Entity [Line Items] |  |
Fair Value Adjustment | 300 | 1,400
On-balance sheet [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 1,132,966 | 708,111
Debt securities of consolidated trusts held by third parties | 1,142,704 | 713,536
On-balance sheet [Member] | Farm & Ranch [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 1,132,966 | 708,111
Debt securities of consolidated trusts held by third parties | 1,142,704 | 713,536
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 | 1,489,417 | 1,494,323
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 | 415,441 | 514,051
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 | 103,976 | 10,272
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 | 970,000 | 970,000
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 | 66,389 | 62,760
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 65,599 | 61,553
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 | 36,042 | 31,360
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 35,599 | 31,553
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 | 30,347 | 31,400
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 30,000 | 30,000
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) | 5,672 | 5,936
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 | 827,874 | 917,292
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 825,909 | 918,121
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 | 827,874 | 917,292
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 825,909 | $ 918,121

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