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Loans and Allowance for Losses and Concentrations of Credit Risk - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1],[2],[3] | $ 6,557,030 | $ 6,139,304
Financing Receivables, Borrower Exposure, Range One [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 2,297,648 | 2,195,103
Financing Receivables, Borrower Exposure, Range Two [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 2,500,101 | 2,398,843
Financing Receivables, Borrower Exposure, Range Three [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 815,411 | 782,171
Financing Receivables, Borrower Exposure, Range Four [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 568,471 | 469,681
Financing Receivables, Borrower Exposure, Range Five [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 375,399 | 293,506
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | $ 1,274,050 | 1,220,432
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit |  | 0.00% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit |  | 40.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Two [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | $ 1,622,767 | 1,466,047
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit |  | 40.01% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit |  | 50.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Three [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | $ 2,268,852 | 2,078,099
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit |  | 50.01% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit |  | 60.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Four [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | $ 1,130,748 | 1,167,395
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit |  | 60.01% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit |  | 70.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Five [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | $ 233,963 | 191,664
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit |  | 70.01% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit |  | 80.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Six [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | $ 26,650 | 15,667
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit |  | 80.01% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit |  | 90.00% |
Northwest [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [3] | $ 723,616 | 657,403
Southwest [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [3] | 1,917,692 | 1,791,745
Mid-North [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [3] | 2,205,750 | 2,104,867
Mid-South [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [3] | 899,293 | 837,121
Northeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [3] | 290,655 | 229,679
Southeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [3] | 520,024 | 518,489
Crops [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 3,593,716 | 3,410,498
Permanent Plantings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 1,184,221 | 1,037,440
Livestock [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 1,309,743 | 1,305,844
Part-Time Farm [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 407,708 | 324,074
Agriculture Storage and Processing [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 48,068 | 48,051
Other Commodity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | $ 13,574 | $ 13,397
[1] | Amounts represent unpaid principal balance of risk-rated loans, which is the basis Farmer Mac uses to analyze its portfolio, and recorded investment of past due loans.
[2] | As of second quarter 2017, Farmer Mac revised its calculation of the original loan-to-value ratio of a loan to combine for any cross-collateralized loans: (i) the original loan principal balance amounts in the numerator and (ii) the original appraised property values in the denominator. In previous periods, the ratio was calculated on a loan-by-loan basis without considering the effects of any cross-collateralization. Prior period information has been reclassified to conform to the current period calculation and presentation.
[3] | Geographic regions: Northwest (AK, ID, MT, OR, WA, WY); Southwest (AZ, CA, CO, HI, NM, NV, UT); Mid-North (IA, IL, IN, MI, MN, NE, ND, SD, WI); Mid-South (AR, KS, LA, MO, OK, TX); Northeast (CT, DE, KY, MA, MD, ME, NH, NJ, NY, OH, PA, RI, VA, VT, WV); Southeast (AL, FL, GA, MS, NC, SC, TN).

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