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Guarantees and Long-Term Standby Purchase Commitments - Cash Flows from Off-balance sheet Guaranteed Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Guarantor Obligations [Line Items] |  |  |
Proceeds from new securitizations | $ 116,708 | $ 131,202 |
Guarantee fees received | 442 | 546 |
Purchases of assets from the trusts(1) | $ (4,721) | $ (721) |
Farmer Mac Guaranteed Securities [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Weighted average remaining maturity, loans underlying guarantees not held by transferor | 10 years 3 months 15 days |  | 10 years 3 months 15 days
Farmer Mac Guaranteed Securities [Member] | Unconsolidated VIEs [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Guarantor obligation, liability | $ 2,700 |  | $ 2,800
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Weighted average remaining maturity, loans underlying guarantees not held by transferor | 4 years 7 months 90 days |  | 5 years 15 days

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- Definition The cash outflow from (a) purchases of loans held-for-investment, (b) purchases of leases held-for-investment, and (c) both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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