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Loans and Allowance for Losses and Concentrations of Credit Risk - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1],[2] | $ 6,139,304 | $ 5,725,299
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | $ 1,740,792 | 1,594,818
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 |  | $ 1,401,630 | 1,279,321
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 |  | $ 1,706,099 | 1,593,025
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 |  | $ 1,086,295 | 1,107,710
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 |  | $ 180,142 | 126,860
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 |  | $ 24,346 | 23,565
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 | [2] | $ 657,403 | 582,127
Southwest [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 1,791,745 | 1,726,927
Mid-North [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 2,104,867 | 2,009,654
Mid-South [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 837,121 | 769,831
Northeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 229,679 | 215,883
Southeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 518,489 | 420,877
Crops [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 3,410,498 | 3,243,651
Permanent Plantings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 1,037,440 | 941,411
Livestock [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 1,305,844 | 1,236,781
Part-Time Farm [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 324,074 | 211,125
Agriculture Storage and Processing [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 48,051 | 81,990
Other Commodity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | $ 13,397 | $ 10,341
[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] | 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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