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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 28,130 |  | $ 28,130 |  | $ 31,457
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 28,199 |  | 28,199 |  | 31,460
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 117,628 |  | 117,628 |  | 115,614
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 117,876 |  | 117,876 |  | 115,623
Impaired Financing Receivable, Recorded Investment | 145,758 |  | 145,758 |  | 147,071
Impaired Financing Receivable, Unpaid Principal Balance | 146,075 |  | 146,075 |  | 147,083
Impaired Financing Receivable, Related Allowance | 3,256 |  | 3,256 |  | 2,884
Financing Receivable, Recorded Investment, Nonaccrual Status | 63,338 |  | 63,338 |  | 63,593
Impaired Financing Receivable, Average Recorded Investment | 154,151 | $ 134,503 | 150,716 | $ 123,262 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 1,334 | 419 | 2,973 | 1,474 |
Crops [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 14,815 |  | 14,815 |  | 14,417
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 14,851 |  | 14,851 |  | 14,418
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 60,250 |  | 60,250 |  | 62,309
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 60,372 |  | 60,372 |  | 62,314
Impaired Financing Receivable, Recorded Investment | 75,065 |  | 75,065 |  | 76,726
Impaired Financing Receivable, Unpaid Principal Balance | 75,223 |  | 75,223 |  | 76,732
Impaired Financing Receivable, Related Allowance | 1,367 |  | 1,367 |  | 1,431
Financing Receivable, Recorded Investment, Nonaccrual Status | 28,098 |  | 28,098 |  | 27,630
Impaired Financing Receivable, Average Recorded Investment | 75,920 | 72,180 | 73,968 | 65,244 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 223 | 101 | 942 | 563 |
Permanent Plantings [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 848 |  | 848 |  | 3,272
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 851 |  | 851 |  | 3,273
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 35,389 |  | 35,389 |  | 37,143
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 35,471 |  | 35,471 |  | 37,146
Impaired Financing Receivable, Recorded Investment | 36,237 |  | 36,237 |  | 40,415
Impaired Financing Receivable, Unpaid Principal Balance | 36,322 |  | 36,322 |  | 40,419
Impaired Financing Receivable, Related Allowance | 1,262 |  | 1,262 |  | 1,063
Financing Receivable, Recorded Investment, Nonaccrual Status | 23,090 |  | 23,090 |  | 25,701
Impaired Financing Receivable, Average Recorded Investment | 44,818 | 38,396 | 44,122 | 35,101 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 933 | 244 | 1,597 | 464 |
Livestock [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,431 |  | 10,431 |  | 11,171
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,456 |  | 10,456 |  | 11,172
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,550 |  | 15,550 |  | 9,376
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,581 |  | 15,581 |  | 9,376
Impaired Financing Receivable, Recorded Investment | 25,981 |  | 25,981 |  | 20,547
Impaired Financing Receivable, Unpaid Principal Balance | 26,037 |  | 26,037 |  | 20,548
Impaired Financing Receivable, Related Allowance | 494 |  | 494 |  | 242
Financing Receivable, Recorded Investment, Nonaccrual Status | 7,859 |  | 7,859 |  | 5,333
Impaired Financing Receivable, Average Recorded Investment | 24,443 | 15,582 | 23,358 | 14,620 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 122 | 13 | 261 | 212 |
Part-Time Farm [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,036 |  | 2,036 |  | 1,953
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,041 |  | 2,041 |  | 1,953
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,368 |  | 6,368 |  | 6,710
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,381 |  | 6,381 |  | 6,711
Impaired Financing Receivable, Recorded Investment | 8,404 |  | 8,404 |  | 8,663
Impaired Financing Receivable, Unpaid Principal Balance | 8,422 |  | 8,422 |  | 8,664
Impaired Financing Receivable, Related Allowance | 132 |  | 132 |  | 146
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,291 |  | 4,291 |  | 4,929
Impaired Financing Receivable, Average Recorded Investment | 8,898 | 7,944 | 8,874 | 8,096 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 56 | 61 | 173 | 235 |
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 | 71 |  | 71 |  | 76
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 71 |  | 71 |  | 76
Impaired Financing Receivable, Recorded Investment | 71 |  | 71 |  | 720
Impaired Financing Receivable, Unpaid Principal Balance | 71 |  | 71 |  | 720
Impaired Financing Receivable, Related Allowance | 1 |  | 1 |  | 2
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  | 0 |  | 0
Impaired Financing Receivable, Average Recorded Investment | 72 | 401 | 394 | 201 |
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 | 115,200 |  | 115,200 |  | 113,200
Impaired Financing Receivable, Related Allowance | $ 2,700 |  | $ 2,700 |  | $ 2,700
Impaired Financing Receivable, Impairment analysis performed percent | 79.00% |  | 79.00% |  | 77.00%
Less than 90 days past due [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 30,600 |  | $ 30,600 |  | $ 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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