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Accounting Policies - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | $ 1,208,950 | $ 1,132,966
Debt securities of consolidated trusts held by third parties | 1,212,792 | 1,142,704
Farm & Ranch [Member] |  |
Variable Interest Entity [Line Items] |  |
Other Liabilities | 3,800 | 9,700
USDA Guarantees [Member] |  |
Variable Interest Entity [Line Items] |  |
Unamortized Premium/(Discount) | 400 | 400
Institutional Credit [Member] |  |
Variable Interest Entity [Line Items] |  |
Fair Value Adjustment | 100 | 300
On-balance sheet [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 1,208,950 | 1,132,966
Debt securities of consolidated trusts held by third parties | 1,212,792 | 1,142,704
On-balance sheet [Member] | Farm & Ranch [Member] |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 1,208,950 | 1,132,966
Debt securities of consolidated trusts held by third parties | 1,212,792 | 1,142,704
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 | 1,492,606 | 1,489,417
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 | 387,272 | 415,441
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 | 135,334 | 103,976
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 | 71,184 | 66,389
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 70,734 | 65,599
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 | 41,130 | 36,042
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 40,734 | 35,599
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 | 30,054 | 30,347
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) | 5,203 | 5,672
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 | 809,988 | 827,874
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 808,155 | 825,909
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 | 809,988 | 827,874
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 808,155 | $ 825,909

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