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Loans and Allowance for Losses and Concentrations of Credit Risk - Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 35,205 |  | $ 31,457
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 35,135 |  | 31,460
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 112,288 |  | 115,614
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 112,097 |  | 115,623
Impaired Financing Receivable, Recorded Investment | 147,493 |  | 147,071
Impaired Financing Receivable, Unpaid Principal Balance | 147,232 |  | 147,083
Impaired Financing Receivable, Related Allowance | 2,708 |  | 2,884
Financing Receivable, Recorded Investment, Nonaccrual Status | 64,312 |  | 63,593
Impaired Financing Receivable, Average Recorded Investment | 147,284 | $ 112,021 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 698 | 734 |
Crops [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 18,940 |  | 14,417
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 18,902 |  | 14,418
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 48,367 |  | 62,309
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 48,290 |  | 62,314
Impaired Financing Receivable, Recorded Investment | 67,307 |  | 76,726
Impaired Financing Receivable, Unpaid Principal Balance | 67,192 |  | 76,732
Impaired Financing Receivable, Related Allowance | 1,021 |  | 1,431
Financing Receivable, Recorded Investment, Nonaccrual Status | 28,211 |  | 27,630
Impaired Financing Receivable, Average Recorded Investment | 72,017 | 58,309 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 392 | 302 |
Permanent Plantings [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,629 |  | 3,272
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,620 |  | 3,273
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 41,809 |  | 37,143
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 41,731 |  | 37,146
Impaired Financing Receivable, Recorded Investment | 46,438 |  | 40,415
Impaired Financing Receivable, Unpaid Principal Balance | 46,351 |  | 40,419
Impaired Financing Receivable, Related Allowance | 1,227 |  | 1,063
Financing Receivable, Recorded Investment, Nonaccrual Status | 24,870 |  | 25,701
Impaired Financing Receivable, Average Recorded Investment | 43,427 | 31,806 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 172 | 152 |
Livestock [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 8,090 |  | 11,171
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 8,074 |  | 11,172
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,910 |  | 9,376
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,884 |  | 9,376
Impaired Financing Receivable, Recorded Investment | 24,000 |  | 20,547
Impaired Financing Receivable, Unpaid Principal Balance | 23,958 |  | 20,548
Impaired Financing Receivable, Related Allowance | 336 |  | 242
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,840 |  | 5,333
Impaired Financing Receivable, Average Recorded Investment | 22,274 | 13,658 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 79 | 177 |
Part-Time Farm [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,909 |  | 1,953
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,904 |  | 1,953
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,128 |  | 6,710
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,118 |  | 6,711
Impaired Financing Receivable, Recorded Investment | 9,037 |  | 8,663
Impaired Financing Receivable, Unpaid Principal Balance | 9,022 |  | 8,664
Impaired Financing Receivable, Related Allowance | 122 |  | 146
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,391 |  | 4,929
Impaired Financing Receivable, Average Recorded Investment | 8,850 | 8,248 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 55 | 103 |
Agriculture Storage and Processing [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0
Impaired Financing Receivable, Recorded Investment | 0 |  | 0
Impaired Financing Receivable, Unpaid Principal Balance | 0 |  | 0
Impaired Financing Receivable, Related Allowance | 0 |  | 0
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 | 0 |
Other Commodity [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 637 |  | 644
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 635 |  | 644
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 74 |  | 76
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 74 |  | 76
Impaired Financing Receivable, Recorded Investment | 711 |  | 720
Impaired Financing Receivable, Unpaid Principal Balance | 709 |  | 720
Impaired Financing Receivable, Related Allowance | 2 |  | 2
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment | 716 | 0 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 | $ 0 |
Collateral Dependent Not Individually Analyzed [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 109,900 |  | 113,200
Impaired Financing Receivable, Related Allowance | $ 2,300 |  | $ 2,700
Impaired Financing Receivable, Impairment analysis performed percent | 75.00% |  | 77.00%
Less than 90 days past due [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 20,700 |  | $ 15,700

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