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Loans and Allowance for Losses and Concentrations of Credit Risk - Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 36,679 |  | $ 36,679 |  | $ 31,457
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 36,698 |  | 36,698 |  | 31,460
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 125,863 |  | 125,863 |  | 115,614
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 125,944 |  | 125,944 |  | 115,623
Impaired Financing Receivable, Recorded Investment | 162,542 |  | 162,542 |  | 147,071
Impaired Financing Receivable, Unpaid Principal Balance | 162,642 |  | 162,642 |  | 147,083
Impaired Financing Receivable, Related Allowance | 3,029 |  | 3,029 |  | 2,884
Financing Receivable, Recorded Investment, Nonaccrual Status | 63,103 |  | 63,103 |  | 63,593
Impaired Financing Receivable, Average Recorded Investment | 155,019 | $ 119,040 | 151,170 | $ 115,161 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 941 | 321 | 1,639 | 1,055 |
Crops [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 13,239 |  | 13,239 |  | 14,417
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 13,249 |  | 13,249 |  | 14,418
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 63,535 |  | 63,535 |  | 62,309
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 63,575 |  | 63,575 |  | 62,314
Impaired Financing Receivable, Recorded Investment | 76,774 |  | 76,774 |  | 76,726
Impaired Financing Receivable, Unpaid Principal Balance | 76,824 |  | 76,824 |  | 76,732
Impaired Financing Receivable, Related Allowance | 1,243 |  | 1,243 |  | 1,431
Financing Receivable, Recorded Investment, Nonaccrual Status | 27,442 |  | 27,442 |  | 27,630
Impaired Financing Receivable, Average Recorded Investment | 72,041 | 65,295 | 74,527 | 61,226 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 327 | 160 | 719 | 462 |
Permanent Plantings [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 12,564 |  | 12,564 |  | 3,272
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 12,565 |  | 12,565 |  | 3,273
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 40,835 |  | 40,835 |  | 37,143
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 40,865 |  | 40,865 |  | 37,146
Impaired Financing Receivable, Recorded Investment | 53,399 |  | 53,399 |  | 40,415
Impaired Financing Receivable, Unpaid Principal Balance | 53,430 |  | 53,430 |  | 40,419
Impaired Financing Receivable, Related Allowance | 1,268 |  | 1,268 |  | 1,063
Financing Receivable, Recorded Investment, Nonaccrual Status | 26,066 |  | 26,066 |  | 25,701
Impaired Financing Receivable, Average Recorded Investment | 49,919 | 33,222 | 45,945 | 32,292 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 492 | 68 | 664 | 220 |
Livestock [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 7,816 |  | 7,816 |  | 11,171
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,822 |  | 7,822 |  | 11,172
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,089 |  | 15,089 |  | 9,376
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,096 |  | 15,096 |  | 9,376
Impaired Financing Receivable, Recorded Investment | 22,905 |  | 22,905 |  | 20,547
Impaired Financing Receivable, Unpaid Principal Balance | 22,918 |  | 22,918 |  | 20,548
Impaired Financing Receivable, Related Allowance | 369 |  | 369 |  | 242
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,142 |  | 5,142 |  | 5,333
Impaired Financing Receivable, Average Recorded Investment | 23,453 | 12,557 | 21,361 | 13,497 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 60 | 22 | 139 | 199 |
Part-Time Farm [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,060 |  | 3,060 |  | 1,953
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,062 |  | 3,062 |  | 1,953
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,331 |  | 6,331 |  | 6,710
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,335 |  | 6,335 |  | 6,711
Impaired Financing Receivable, Recorded Investment | 9,391 |  | 9,391 |  | 8,663
Impaired Financing Receivable, Unpaid Principal Balance | 9,397 |  | 9,397 |  | 8,664
Impaired Financing Receivable, Related Allowance | 123 |  | 123 |  | 146
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,453 |  | 4,453 |  | 4,929
Impaired Financing Receivable, Average Recorded Investment | 9,214 | 7,926 | 8,780 | 8,119 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 62 | 71 | 117 | 174 |
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 |  | 0 |  | 0
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 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 0 | 0 |
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 | 0 |  | 0 |  | 644
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 644
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 73 |  | 73 |  | 76
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 73 |  | 73 |  | 76
Impaired Financing Receivable, Recorded Investment | 73 |  | 73 |  | 720
Impaired Financing Receivable, Unpaid Principal Balance | 73 |  | 73 |  | 720
Impaired Financing Receivable, Related Allowance | 26 |  | 26 |  | 2
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment | 392 | 40 | 557 | 27 |
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 | 123,500 |  | 123,500 |  | 113,200
Impaired Financing Receivable, Related Allowance | $ 2,600 |  | $ 2,600 |  | $ 2,700
Impaired Financing Receivable, Impairment analysis performed percent | 76.00% |  | 76.00% |  | 77.00%
Less than 90 days past due [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 27,400 |  | $ 27,400 |  | $ 15,700

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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