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Loans and Allowance for Losses and Concentrations of Credit Risk - Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 31,457 | $ 27,468
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 31,460 | 27,534
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 115,614 | 79,931
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 115,623 | 80,205
Impaired Financing Receivable, Recorded Investment | 147,071 | 107,399
Impaired Financing Receivable, Unpaid Principal Balance | 147,083 | 107,739
Impaired Financing Receivable, Related Allowance | 2,884 | 2,292
Financing Receivable, Recorded Investment, Nonaccrual Status | 63,593 | 32,142
Impaired Financing Receivable, Average Recorded Investment | 133,180 | 82,803
Impaired Financing Receivable, Interest Income, Cash Basis Method | 1,753 | 1,569
Crops [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 14,417 | 20,761
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,418 | 20,816
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 62,309 | 32,326
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 62,314 | 32,381
Impaired Financing Receivable, Recorded Investment | 76,726 | 53,087
Impaired Financing Receivable, Unpaid Principal Balance | 76,732 | 53,197
Impaired Financing Receivable, Related Allowance | 1,431 | 945
Financing Receivable, Recorded Investment, Nonaccrual Status | 27,630 | 13,405
Impaired Financing Receivable, Average Recorded Investment | 71,154 | 33,252
Impaired Financing Receivable, Interest Income, Cash Basis Method | 696 | 136
Permanent Plantings [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,272 | 3,683
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,273 | 3,688
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 37,143 | 26,748
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 37,146 | 26,817
Impaired Financing Receivable, Recorded Investment | 40,415 | 30,431
Impaired Financing Receivable, Unpaid Principal Balance | 40,419 | 30,505
Impaired Financing Receivable, Related Allowance | 1,063 | 790
Financing Receivable, Recorded Investment, Nonaccrual Status | 25,701 | 10,785
Impaired Financing Receivable, Average Recorded Investment | 37,597 | 24,737
Impaired Financing Receivable, Interest Income, Cash Basis Method | 530 | 866
Livestock [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 11,171 | 1,054
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,172 | 1,055
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 9,376 | 14,322
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 9,376 | 14,457
Impaired Financing Receivable, Recorded Investment | 20,547 | 15,376
Impaired Financing Receivable, Unpaid Principal Balance | 20,548 | 15,512
Impaired Financing Receivable, Related Allowance | 242 | 399
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,333 | 2,696
Impaired Financing Receivable, Average Recorded Investment | 15,913 | 14,450
Impaired Financing Receivable, Interest Income, Cash Basis Method | 238 | 238
Part-Time Farm [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,953 | 1,970
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,953 | 1,975
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,710 | 6,535
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,711 | 6,550
Impaired Financing Receivable, Recorded Investment | 8,663 | 8,505
Impaired Financing Receivable, Unpaid Principal Balance | 8,664 | 8,525
Impaired Financing Receivable, Related Allowance | 146 | 158
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,929 | 5,256
Impaired Financing Receivable, Average Recorded Investment | 8,135 | 8,396
Impaired Financing Receivable, Interest Income, Cash Basis Method | 289 | 329
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 | 1,968
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 | 644 | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 644 | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 76 | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 76 | 0
Impaired Financing Receivable, Recorded Investment | 720 | 0
Impaired Financing Receivable, Unpaid Principal Balance | 720 | 0
Impaired Financing Receivable, Related Allowance | 2 | 0
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 381 | 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 | 113,200 | 76,500
Impaired Financing Receivable, Related Allowance | $ 2,700 | $ 1,600
Impaired Financing Receivable, Impairment analysis performed percent | 77.00% | 71.00%
Less than 90 days past due [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 15,700 | $ 12,400

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