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Loans and Allowance for Losses and Concentrations of Credit Risk - Allowance for Credit Losses Roll Forward (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 162,542,000 |  | $ 162,542,000 |  | $ 147,071,000
Financing Receivable, Recorded Investment, Past Due | 43,076,000 |  | 43,076,000 |  | 48,444,000
Impaired Financing Receivable, Related Allowance | 3,029,000 |  | 3,029,000 |  | 2,884,000
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Subject To Be Purchased | 700,000 |  | 700,000 |  | 300,000
Financing Receivable, Recorded Investment, Nonaccrual Status | 63,103,000 |  | 63,103,000 |  | 63,593,000
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Allowance for Loan Losses |  |  | 6,796,000 |  |
Beginning Balance - Reserve for Losses |  |  | 2,070,000 |  |
Beginning Balance - Total Allowance for Losses | 8,456,000 | $ 7,638,000 | 8,866,000 | $ 7,435,000 |
(Provision for)/release of loan losses | (424,000) | (327,000) | 7,000 | (964,000) |
Provision for/(release of) reserve for losses | 158,000 | 139,000 | 179,000 | (54,000) |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  | 0 | (241,000) |
Total provision for losses | 582,000 | 466,000 | 172,000 | 910,000 |
Ending Balance - Allowance for Loan Losses | 6,789,000 |  | 6,789,000 |  |
Ending Balance - Reserve for Losses | 2,249,000 |  | 2,249,000 |  |
Ending Balance - Total Allowance for Losses | 9,038,000 | 8,104,000 | 9,038,000 | 8,104,000 |
Crops [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 76,774,000 |  | 76,774,000 |  | 76,726,000
Financing Receivable, Recorded Investment, Past Due | 23,037,000 |  | 23,037,000 |  | 21,853,000
Impaired Financing Receivable, Related Allowance | 1,243,000 |  | 1,243,000 |  | 1,431,000
Financing Receivable, Recorded Investment, Nonaccrual Status | 27,442,000 |  | 27,442,000 |  | 27,630,000
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Total Allowance for Losses | 3,793,000 | 3,562,000 | 4,081,000 | 3,365,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  | (228,000) |
Total provision for losses | 332,000 | 173,000 | 44,000 | 598,000 |
Ending Balance - Total Allowance for Losses | 4,125,000 | 3,735,000 | 4,125,000 | 3,735,000 |
Permanent Plantings [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 53,399,000 |  | 53,399,000 |  | 40,415,000
Financing Receivable, Recorded Investment, Past Due | 8,363,000 |  | 8,363,000 |  | 18,833,000
Impaired Financing Receivable, Related Allowance | 1,268,000 |  | 1,268,000 |  | 1,063,000
Financing Receivable, Recorded Investment, Nonaccrual Status | 26,066,000 |  | 26,066,000 |  | 25,701,000
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Total Allowance for Losses | 2,479,000 | 1,870,000 | 2,469,000 | 1,723,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  | 0 |
Total provision for losses | (111,000) | 294,000 | (101,000) | 441,000 |
Ending Balance - Total Allowance for Losses | 2,368,000 | 2,164,000 | 2,368,000 | 2,164,000 |
Livestock [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 22,905,000 |  | 22,905,000 |  | 20,547,000
Financing Receivable, Recorded Investment, Past Due | 7,739,000 |  | 7,739,000 |  | 3,835,000
Impaired Financing Receivable, Related Allowance | 369,000 |  | 369,000 |  | 242,000
Financing Receivable, Recorded Investment, Nonaccrual Status | 5,142,000 |  | 5,142,000 |  | 5,333,000
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Total Allowance for Losses | 1,236,000 | 1,379,000 | 1,211,000 | 1,375,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  | (13,000) |
Total provision for losses | 86,000 | (145,000) | 111,000 | (128,000) |
Ending Balance - Total Allowance for Losses | 1,322,000 | 1,234,000 | 1,322,000 | 1,234,000 |
Part-Time Farm [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 9,391,000 |  | 9,391,000 |  | 8,663,000
Financing Receivable, Recorded Investment, Past Due | 3,937,000 |  | 3,937,000 |  | 3,923,000
Impaired Financing Receivable, Related Allowance | 123,000 |  | 123,000 |  | 146,000
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,453,000 |  | 4,453,000 |  | 4,929,000
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Total Allowance for Losses | 413,000 | 324,000 | 481,000 | 405,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  | 0 |
Total provision for losses | 35,000 | 73,000 | (33,000) | (8,000) |
Ending Balance - Total Allowance for Losses | 448,000 | 397,000 | 448,000 | 397,000 |
Agriculture Storage and Processing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 0 |  | 0 |  | 0
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0 |  | 0
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 0
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Total Allowance for Losses | 522,000 | 472,000 | 606,000 | 533,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  | 0 |
Total provision for losses | 198,000 | 86,000 | 114,000 | 25,000 |
Ending Balance - Total Allowance for Losses | 720,000 | 558,000 | 720,000 | 558,000 |
Other Commodity [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 73,000 |  | 73,000 |  | 720,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0 |  | 0
Impaired Financing Receivable, Related Allowance | 26,000 |  | 26,000 |  | 2,000
Financing Receivable, Recorded Investment, Nonaccrual Status | 0 |  | 0 |  | $ 0
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Total Allowance for Losses | 13,000 | 31,000 | 18,000 | 34,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  |  | 0 |
Total provision for losses | 42,000 | (15,000) | 37,000 | (18,000) |
Ending Balance - Total Allowance for Losses | 55,000 | 16,000 | 55,000 | 16,000 |
Allowance for Loan and Lease Losses [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Allowance for Loan Losses | 6,365,000 | 5,811,000 | 6,796,000 | 5,415,000 |
(Provision for)/release of loan losses | (424,000) | (327,000) | 7,000 | (964,000) |
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 | 0 | (241,000) |
Ending Balance - Allowance for Loan Losses | 6,789,000 | 6,138,000 | 6,789,000 | 6,138,000 |
Reserve for Off-balance Sheet Activities [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance - Reserve for Losses | 2,091,000 | 1,827,000 | 2,070,000 | 2,020,000 |
Provision for/(release of) reserve for losses | 158,000 | 139,000 | 179,000 | (54,000) |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  | 0 | 0 |
Ending Balance - Reserve for Losses | $ 2,249,000 | $ 1,966,000 | $ 2,249,000 | $ 1,966,000 |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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