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Loans and Allowance for Losses and Concentrations of Credit Risk - Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 23,397 |  |  | $ 23,397 |  |  | $ 27,468 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 23,352 |  |  | 23,352 |  |  | 27,534 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 124,170 | [1] |  | 124,170 | [1] |  | 79,931 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 123,966 |  |  | 123,966 |  |  | 80,205 |
Impaired Financing Receivable, Recorded Investment | 147,567 |  |  | 147,567 |  |  | 107,399 |
Impaired Financing Receivable, Unpaid Principal Balance | 147,318 |  |  | 147,318 |  |  | 107,739 |
Impaired Financing Receivable, Related Allowance | 2,937 |  |  | 2,937 |  |  | 2,292 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 63,044 | [3] |  | 63,044 | [3] |  | 32,142 | [4]
Impaired Financing Receivable, Average Recorded Investment | 134,503 |  | $ 76,304 | 123,262 |  | $ 80,596 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 419 |  | 437 | 1,474 |  | 1,377 |  |
Crops [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 11,909 |  |  | 11,909 |  |  | 20,761 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,885 |  |  | 11,885 |  |  | 20,816 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 65,391 | [1] |  | 65,391 | [1] |  | 32,326 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 65,284 |  |  | 65,284 |  |  | 32,381 |
Impaired Financing Receivable, Recorded Investment | 77,300 |  |  | 77,300 |  |  | 53,087 |
Impaired Financing Receivable, Unpaid Principal Balance | 77,169 |  |  | 77,169 |  |  | 53,197 |
Impaired Financing Receivable, Related Allowance | 1,422 |  |  | 1,422 |  |  | 945 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 29,535 | [3] |  | 29,535 | [3] |  | 13,405 | [4]
Impaired Financing Receivable, Average Recorded Investment | 72,180 |  | 33,032 | 65,244 |  | 28,293 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 101 |  | 46 | 563 |  | 108 |  |
Permanent Plantings [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,963 |  |  | 4,963 |  |  | 3,683 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,953 |  |  | 4,953 |  |  | 3,688 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 38,565 | [1] |  | 38,565 | [1] |  | 26,748 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 38,497 |  |  | 38,497 |  |  | 26,817 |
Impaired Financing Receivable, Recorded Investment | 43,528 |  |  | 43,528 |  |  | 30,431 |
Impaired Financing Receivable, Unpaid Principal Balance | 43,450 |  |  | 43,450 |  |  | 30,505 |
Impaired Financing Receivable, Related Allowance | 1,068 |  |  | 1,068 |  |  | 790 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 25,653 | [3] |  | 25,653 | [3] |  | 10,785 | [4]
Impaired Financing Receivable, Average Recorded Investment | 38,396 |  | 22,980 | 35,101 |  | 25,277 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 244 |  | 236 | 464 |  | 789 |  |
Livestock [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,942 |  |  | 3,942 |  |  | 1,054 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,935 |  |  | 3,935 |  |  | 1,055 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 14,048 | [1] |  | 14,048 | [1] |  | 14,322 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 14,029 |  |  | 14,029 |  |  | 14,457 |
Impaired Financing Receivable, Recorded Investment | 17,990 |  |  | 17,990 |  |  | 15,376 |
Impaired Financing Receivable, Unpaid Principal Balance | 17,964 |  |  | 17,964 |  |  | 15,512 |
Impaired Financing Receivable, Related Allowance | 309 |  |  | 309 |  |  | 399 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,819 | [3] |  | 2,819 | [3] |  | 2,696 | [4]
Impaired Financing Receivable, Average Recorded Investment | 15,582 |  | 12,120 | 14,620 |  | 13,704 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 13 |  | 81 | 212 |  | 229 |  |
Part-Time Farm [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,939 |  |  | 1,939 |  |  | 1,970 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,936 |  |  | 1,936 |  |  | 1,975 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,088 | [1] |  | 6,088 | [1] |  | 6,535 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,078 |  |  | 6,078 |  |  | 6,550 |
Impaired Financing Receivable, Recorded Investment | 8,027 |  |  | 8,027 |  |  | 8,505 |
Impaired Financing Receivable, Unpaid Principal Balance | 8,014 |  |  | 8,014 |  |  | 8,525 |
Impaired Financing Receivable, Related Allowance | 136 |  |  | 136 |  |  | 158 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,037 | [3] |  | 5,037 | [3] |  | 5,256 | [4]
Impaired Financing Receivable, Average Recorded Investment | 7,944 |  | 8,172 | 8,096 |  | 8,654 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 61 |  | 74 | 235 |  | 251 |  |
Agriculture Storage and Processing [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  |  | 0 |  |  | 0 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  |  | 0 |  |  | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  |  | 0 |  |  | 0 |
Impaired Financing Receivable, Recorded Investment | 0 |  |  | 0 |  |  | 0 |
Impaired Financing Receivable, Unpaid Principal Balance | 0 |  |  | 0 |  |  | 0 |
Impaired Financing Receivable, Related Allowance | 0 |  |  | 0 |  |  | 0 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 | [3] |  | 0 | [3] |  | 0 | [4]
Impaired Financing Receivable, Average Recorded Investment | 0 |  | 0 | 0 |  | 4,668 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 |  | 0 | 0 |  | 0 |  |
Other Commodity [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 644 |  |  | 644 |  |  | 0 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 643 |  |  | 643 |  |  | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 78 | [1] |  | 78 | [1] |  | 0 | [2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 78 |  |  | 78 |  |  | 0 |
Impaired Financing Receivable, Recorded Investment | 722 |  |  | 722 |  |  | 0 |
Impaired Financing Receivable, Unpaid Principal Balance | 721 |  |  | 721 |  |  | 0 |
Impaired Financing Receivable, Related Allowance | 2 |  |  | 2 |  |  | 0 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 | [3] |  | 0 | [3] |  | 0 | [4]
Impaired Financing Receivable, Average Recorded Investment | 401 |  | 0 | 201 |  | 0 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 |  | $ 0 | 0 |  | $ 0 |  |
Collateral Dependent Not Individually Analyzed [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 123,300 |  |  | 123,300 |  |  | 76,500 |
Impaired Financing Receivable, Related Allowance | $ 2,700 |  |  | $ 2,700 |  |  | $ 1,600 |
Impaired Financing Receivable, Impairment analysis performed percent | 84.00% |  |  | 84.00% |  |  | 71.00% |
Less than 90 days past due [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 0 | [3] |  | $ 0 | [3] |  | $ 12,400 | [4]
[1] | Impairment analysis was performed in the aggregate in consideration of similar risk characteristics of the assets and historical statistics on $123.3 million (84 percent) of impaired loans as of September 30, 2017, which resulted in a specific allowance of $2.7 million.
[2] | Impairment analysis was performed in the aggregate in consideration of similar risk characteristics of the assets and historical statistics on $76.5 million (71 percent) of impaired loans as of December 31, 2016, which resulted in a specific allowance of $1.6 million.
[3] | Includes no loans that are less than 90 days delinquent but which have not met Farmer Mac's performance criteria for returning to accrual status.
[4] | Includes $12.4 million of loans that are less than 90 days delinquent but which have not met Farmer Mac's performance criteria for returning to accrual status.

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