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Guarantees and Long Term Standby Purchase Commitments - Long-Term Standby Purchase Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Guarantee obligations issued after January 1, 2003 [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 4,000,000 | $ 4,900,000
Long-Term Standby Purchase Commitments [Member] |  |
Guarantor Obligations [Line Items] |  |
Weighted average remaining maturity, Loans underlying guarantees not held by transferor | 15 years 3 months 10 days | 15 years 1 month 10 days
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 3,100,000 | $ 3,088,007
Long-Term Standby Purchase Commitments [Member] | Guarantee obligations issued after January 1, 2003 [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 34,800 | 31,800
Farm & Ranch Loans and USDA Guarantees [Member] |  |
Guarantor Obligations [Line Items] |  |
Loans and Leases Receivable, Commitments to Purchase or Sell | 46,300 | 114,500
Rural Utilities Loans [Member] |  |
Guarantor Obligations [Line Items] |  |
Loans and Leases Receivable, Commitments to Purchase or Sell | $ 8,000 | $ 0

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- Definition Weighted average remaining maturity, Loans underlying guarantees not held by transferor + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61044-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61082-112788 + Details
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