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Loans and Allowance for Losses and Concentrations of Credit Risk - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1],[2] | $ 6,426,518 | $ 6,139,304
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | $ 1,250,561 | 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 |  | $ 1,607,806 | 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 |  | $ 2,170,648 | 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 |  | $ 1,149,539 | 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 |  | $ 220,932 | 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 |  | $ 27,032 | 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 | [2] | $ 706,366 | 657,403
Southwest [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 1,898,171 | 1,791,745
Mid-North [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 2,196,291 | 2,104,867
Mid-South [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 860,428 | 837,121
Northeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 259,254 | 229,679
Southeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [2] | 506,008 | 518,489
Crops [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 3,528,351 | 3,410,498
Permanent Plantings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 1,149,560 | 1,037,440
Livestock [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 1,298,651 | 1,305,844
Part-Time Farm [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 382,744 | 324,074
Agriculture Storage and Processing [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | 53,999 | 48,051
Other Commodity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross | [1] | $ 13,213 | $ 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] | 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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