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Loans and Allowance for Losses and Concentrations of Credit Risk - Allowance for Credit Losses Roll Forward (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 147,071 |  |  |  | $ 107,399 |  |  |  | $ 147,071 | $ 107,399 |
Financing Receivable, Recorded Investment, Past Due | 48,444 |  |  |  | 21,038 |  |  |  | 48,444 | 21,038 |
Impaired Financing Receivable, Related Allowance | 2,884 |  |  |  | 2,292 |  |  |  | 2,884 | 2,292 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Subject To Be Purchased | 300 |  |  |  | 100 |  |  |  | 300 | 100 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 63,593 |  |  |  | 32,142 |  |  |  | 63,593 | 32,142 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Allowance for Loan Losses |  |  |  | $ 5,415 |  |  |  |  | 5,415 |  |
Beginning Balance - Reserve for Losses |  |  |  | 2,020 |  |  |  |  | 2,020 |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 7,435 |  |  |  | $ 6,563 | 7,435 | 6,563 | $ 10,127
Provision for loan losses | (474) | $ (270) | $ (327) | (637) | (461) | $ (191) | $ (364) | (49) | (1,708) | (1,065) | (2,388)
Provision for/(release of) reserve for losses |  |  |  |  |  |  |  |  | 50 | (63) | (2,180)
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | (327) | (130) | (3,772)
Total provision for losses |  |  |  |  |  |  |  |  | 1,758 | 1,002 | 208
Ending Balance - Allowance for Loan Losses | 6,796 |  |  |  | 5,415 |  |  |  | 6,796 | 5,415 |
Ending Balance - Reserve for Losses | 2,070 |  |  |  | 2,020 |  |  |  | 2,070 | 2,020 |
Ending Balance - Total Allowance for Losses | 8,866 |  |  |  | 7,435 |  |  |  | 8,866 | 7,435 | 6,563
Crops [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 76,726 |  |  |  | 53,087 |  |  |  | 76,726 | 53,087 |
Financing Receivable, Recorded Investment, Past Due | 21,853 |  |  |  | 13,822 |  |  |  | 21,853 | 13,822 |
Impaired Financing Receivable, Related Allowance | 1,431 |  |  |  | 945 |  |  |  | 1,431 | 945 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 27,630 |  |  |  | 13,405 |  |  |  | 27,630 | 13,405 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 3,365 |  |  |  | 2,791 | 3,365 | 2,791 | 2,519
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | (228) | 0 | 0
Total provision for losses |  |  |  |  |  |  |  |  | 944 | 574 | 272
Ending Balance - Total Allowance for Losses | 4,081 |  |  |  | 3,365 |  |  |  | 4,081 | 3,365 | 2,791
Permanent Plantings [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 40,415 |  |  |  | 30,431 |  |  |  | 40,415 | 30,431 |
Financing Receivable, Recorded Investment, Past Due | 18,833 |  |  |  | 3,652 |  |  |  | 18,833 | 3,652 |
Impaired Financing Receivable, Related Allowance | 1,063 |  |  |  | 790 |  |  |  | 1,063 | 790 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 25,701 |  |  |  | 10,785 |  |  |  | 25,701 | 10,785 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 1,723 |  |  |  | 931 | 1,723 | 931 | 2,159
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | (70) | 0 | 0
Total provision for losses |  |  |  |  |  |  |  |  | 816 | 792 | (1,228)
Ending Balance - Total Allowance for Losses | 2,469 |  |  |  | 1,723 |  |  |  | 2,469 | 1,723 | 931
Livestock [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 20,547 |  |  |  | 15,376 |  |  |  | 20,547 | 15,376 |
Financing Receivable, Recorded Investment, Past Due | 3,835 |  |  |  | 707 |  |  |  | 3,835 | 707 |
Impaired Financing Receivable, Related Allowance | 242 |  |  |  | 399 |  |  |  | 242 | 399 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,333 |  |  |  | 2,696 |  |  |  | 5,333 | 2,696 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 1,375 |  |  |  | 1,781 | 1,375 | 1,781 | 1,423
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | (13) | 0 | 0
Total provision for losses |  |  |  |  |  |  |  |  | (151) | (406) | 358
Ending Balance - Total Allowance for Losses | 1,211 |  |  |  | 1,375 |  |  |  | 1,211 | 1,375 | 1,781
Part-Time Farm [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 8,663 |  |  |  | 8,505 |  |  |  | 8,663 | 8,505 |
Financing Receivable, Recorded Investment, Past Due | 3,923 |  |  |  | 2,857 |  |  |  | 3,923 | 2,857 |
Impaired Financing Receivable, Related Allowance | 146 |  |  |  | 158 |  |  |  | 146 | 158 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,929 |  |  |  | 5,256 |  |  |  | 4,929 | 5,256 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 405 |  |  |  | 408 | 405 | 408 | 467
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | (16) | (130) | (111)
Total provision for losses |  |  |  |  |  |  |  |  | 92 | 127 | 52
Ending Balance - Total Allowance for Losses | 481 |  |  |  | 405 |  |  |  | 481 | 405 | 408
Agriculture Storage and Processing [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Financing Receivable, Recorded Investment, Past Due | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Impaired Financing Receivable, Related Allowance | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 533 |  |  |  | 649 | 533 | 649 | 3,552
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | 0 | 0 | (3,661)
Total provision for losses |  |  |  |  |  |  |  |  | 73 | (116) | 758
Ending Balance - Total Allowance for Losses | 606 |  |  |  | 533 |  |  |  | 606 | 533 | 649
Other Commodity [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 720 |  |  |  | 0 |  |  |  | 720 | 0 |
Financing Receivable, Recorded Investment, Past Due | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Impaired Financing Receivable, Related Allowance | 2 |  |  |  | 0 |  |  |  | 2 | 0 |
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Total Allowance for Losses |  |  |  | 34 |  |  |  | 3 | 34 | 3 | 7
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total provision for losses |  |  |  |  |  |  |  |  | (16) | 31 | (4)
Ending Balance - Total Allowance for Losses | 18 |  |  |  | 34 |  |  |  | 18 | 34 | 3
Allowance for Loan and Lease Losses [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Allowance for Loan Losses |  |  |  | 5,415 |  |  |  | 4,480 | 5,415 | 4,480 | 5,864
Provision for loan losses |  |  |  |  |  |  |  |  | (1,708) | (1,065) | (2,388)
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | (327) | (130) | (3,772)
Ending Balance - Allowance for Loan Losses | 6,796 |  |  |  | 5,415 |  |  |  | 6,796 | 5,415 | 4,480
Reserve for Off-balance Sheet Activities [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance - Reserve for Losses |  |  |  | $ 2,020 |  |  |  | $ 2,083 | 2,020 | 2,083 | 4,263
Provision for/(release of) reserve for losses |  |  |  |  |  |  |  |  | 50 | (63) | (2,180)
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ending Balance - Reserve for Losses | $ 2,070 |  |  |  | $ 2,020 |  |  |  | $ 2,070 | $ 2,020 | $ 2,083

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