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Loans and Allowance for Losses and Concentrations of Credit Risk - Loan (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses, Recovery |  | $ 45,000 |  |
Loans and Leases Receivable, Gross |  |  | $ 3,379,884,000 | $ 3,258,413,000
Allowance for Loan and Lease Losses, Real Estate |  |  | 5,415,000 | 4,480,000
Loans and Leases Receivable, Net Amount |  |  | 4,507,435,000 | 3,962,044,000
Real Estate Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | [1] |  | 4,513,966,000 | 3,966,101,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums |  |  | (1,116,000) | 423,000
Loans and Leases Receivable, Gross |  |  | 4,512,850,000 | 3,966,524,000
Allowance for Loan and Lease Losses, Real Estate |  |  | 5,415,000 | 4,480,000
Loans and Leases Receivable, Net Amount |  |  | 4,507,435,000 | 3,962,044,000
Real Estate Loan [Member] | Farm & Ranch [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance |  |  | 3,514,454,000 | 2,957,975,000
Real Estate Loan [Member] | Rural Utilities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance |  |  | 999,512,000 | 1,008,126,000
Unsecuritized [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | [1] |  | 3,381,000,000 | 3,257,990,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums |  |  | (1,116,000) | 423,000
Loans and Leases Receivable, Gross |  |  | 3,379,884,000 | 3,258,413,000
Allowance for Loan and Lease Losses, Real Estate |  |  | 4,437,000 | 3,736,000
Loans and Leases Receivable, Net Amount |  |  | 3,375,447,000 | 3,254,677,000
Unsecuritized [Member] | Farm & Ranch [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance |  |  | 2,381,488,000 | 2,249,864,000
Unsecuritized [Member] | Rural Utilities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance |  |  | 999,512,000 | 1,008,126,000
In Consolidated Trusts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | [1] |  | 1,132,966,000 | 708,111,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums |  |  | 0 | 0
Loans and Leases Receivable, Gross |  |  | 1,132,966,000 | 708,111,000
Allowance for Loan and Lease Losses, Real Estate |  |  | 978,000 | 744,000
Loans and Leases Receivable, Net Amount |  |  | 1,131,988,000 | 707,367,000
In Consolidated Trusts [Member] | Farm & Ranch [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance |  |  | 1,132,966,000 | 708,111,000
In Consolidated Trusts [Member] | Rural Utilities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance |  |  | $ 0 | $ 0
[1] | Unpaid principal balance is the basis of presentation in disclosures of outstanding balances for Farmer Mac's lines of business.

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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