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Loans and Allowance for Losses and Concentrations of Credit Risk - Allowance for Losses by Impairment Method and Commodity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | $ 6,720,503 | $ 6,031,565 |  |
Financing Receivable, Individually Evaluated for Impairment | 147,083 | 107,739 |  |
Financing Receivable, Gross | 6,867,586 | 6,139,304 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 5,982 | 5,143 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,884 | 2,292 |  |
Financing Receivable, Allowance for Credit Losses | 8,866 | 7,435 | $ 6,563 | $ 10,127
Total provision for losses | 1,758 | 1,002 | 208 |
Financing Receivable, Allowance for Credit Losses, Write-downs | (327) | (130) | (3,772) |
Crops [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 3,581,213 | 3,357,301 |  |
Financing Receivable, Individually Evaluated for Impairment | 76,732 | 53,197 |  |
Financing Receivable, Gross | 3,657,945 | 3,410,498 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 2,650 | 2,420 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,431 | 945 |  |
Financing Receivable, Allowance for Credit Losses | 4,081 | 3,365 | 2,791 | 2,519
Total provision for losses | 944 | 574 | 272 |
Financing Receivable, Allowance for Credit Losses, Write-downs | (228) | 0 | 0 |
Permanent Plantings [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 1,327,144 | 1,006,935 |  |
Financing Receivable, Individually Evaluated for Impairment | 40,419 | 30,505 |  |
Financing Receivable, Gross | 1,367,563 | 1,037,440 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,406 | 933 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,063 | 790 |  |
Financing Receivable, Allowance for Credit Losses | 2,469 | 1,723 | 931 | 2,159
Total provision for losses | 816 | 792 | (1,228) |
Financing Receivable, Allowance for Credit Losses, Write-downs | (70) | 0 | 0 |
Livestock [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 1,314,410 | 1,290,332 |  |
Financing Receivable, Individually Evaluated for Impairment | 20,548 | 15,512 |  |
Financing Receivable, Gross | 1,334,958 | 1,305,844 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 969 | 976 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 242 | 399 |  |
Financing Receivable, Allowance for Credit Losses | 1,211 | 1,375 | 1,781 | 1,423
Total provision for losses | (151) | (406) | 358 |
Financing Receivable, Allowance for Credit Losses, Write-downs | (13) | 0 | 0 |
Part-Time Farm [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 424,964 | 315,549 |  |
Financing Receivable, Individually Evaluated for Impairment | 8,664 | 8,525 |  |
Financing Receivable, Gross | 433,628 | 324,074 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 335 | 247 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 146 | 158 |  |
Financing Receivable, Allowance for Credit Losses | 481 | 405 | 408 | 467
Total provision for losses | 92 | 127 | 52 |
Financing Receivable, Allowance for Credit Losses, Write-downs | (16) | (130) | (111) |
Agriculture Storage and Processing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 58,761 | 48,051 |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Gross | 58,761 | 48,051 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 606 | 533 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses | 606 | 533 | 649 | 3,552
Total provision for losses | 73 | (116) | 758 |
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 | (3,661) |
Other Commodity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 14,011 | 13,397 |  |
Financing Receivable, Individually Evaluated for Impairment | 720 | 0 |  |
Financing Receivable, Gross | 14,731 | 13,397 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 16 | 34 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2 | 0 |  |
Financing Receivable, Allowance for Credit Losses | 18 | 34 | 3 | $ 7
Total provision for losses | (16) | 31 | (4) |
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 | 0 |
On-balance sheet [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 4,066,457 | 3,426,768 |  |
Financing Receivable, Individually Evaluated for Impairment | 132,276 | 87,686 |  |
Financing Receivable, Gross | 4,198,733 | 3,514,454 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 4,285 | 3,630 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,511 | 1,785 |  |
Financing Receivable, Allowance for Credit Losses | 6,796 | 5,415 |  |
On-balance sheet [Member] | Crops [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 2,344,821 | 2,115,450 |  |
Financing Receivable, Individually Evaluated for Impairment | 67,828 | 41,648 |  |
Financing Receivable, Gross | 2,412,649 | 2,157,098 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 2,104 | 2,000 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,207 | 613 |  |
Financing Receivable, Allowance for Credit Losses | 3,311 | 2,613 |  |
On-balance sheet [Member] | Permanent Plantings [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 794,478 | 569,360 |  |
Financing Receivable, Individually Evaluated for Impairment | 38,180 | 27,770 |  |
Financing Receivable, Gross | 832,658 | 597,130 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,101 | 652 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,006 | 770 |  |
Financing Receivable, Allowance for Credit Losses | 2,107 | 1,422 |  |
On-balance sheet [Member] | Livestock [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 635,768 | 537,859 |  |
Financing Receivable, Individually Evaluated for Impairment | 17,766 | 10,658 |  |
Financing Receivable, Gross | 653,534 | 548,517 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 738 | 735 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 172 | 270 |  |
Financing Receivable, Allowance for Credit Losses | 910 | 1,005 |  |
On-balance sheet [Member] | Part-Time Farm [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 269,337 | 183,660 |  |
Financing Receivable, Individually Evaluated for Impairment | 7,858 | 7,610 |  |
Financing Receivable, Gross | 277,195 | 191,270 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 287 | 193 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 126 | 132 |  |
Financing Receivable, Allowance for Credit Losses | 413 | 325 |  |
On-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 13,023 | 11,545 |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Gross | 13,023 | 11,545 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 44 | 22 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses | 44 | 22 |  |
On-balance sheet [Member] | Other Commodity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 9,030 | 8,894 |  |
Financing Receivable, Individually Evaluated for Impairment | 644 | 0 |  |
Financing Receivable, Gross | 9,674 | 8,894 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 11 | 28 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses | 11 | 28 |  |
Off-balance sheet [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 2,654,046 | 2,604,797 |  |
Financing Receivable, Individually Evaluated for Impairment | 14,807 | 20,053 |  |
Financing Receivable, Gross | 2,668,853 | 2,624,850 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,697 | 1,513 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 373 | 507 |  |
Financing Receivable, Allowance for Credit Losses | 2,070 | 2,020 |  |
Off-balance sheet [Member] | Crops [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 1,236,392 | 1,241,851 |  |
Financing Receivable, Individually Evaluated for Impairment | 8,904 | 11,549 |  |
Financing Receivable, Gross | 1,245,296 | 1,253,400 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 546 | 420 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 224 | 332 |  |
Financing Receivable, Allowance for Credit Losses | 770 | 752 |  |
Off-balance sheet [Member] | Permanent Plantings [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 532,666 | 437,575 |  |
Financing Receivable, Individually Evaluated for Impairment | 2,239 | 2,735 |  |
Financing Receivable, Gross | 534,905 | 440,310 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 305 | 281 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 57 | 20 |  |
Financing Receivable, Allowance for Credit Losses | 362 | 301 |  |
Off-balance sheet [Member] | Livestock [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 678,642 | 752,473 |  |
Financing Receivable, Individually Evaluated for Impairment | 2,782 | 4,854 |  |
Financing Receivable, Gross | 681,424 | 757,327 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 231 | 241 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 70 | 129 |  |
Financing Receivable, Allowance for Credit Losses | 301 | 370 |  |
Off-balance sheet [Member] | Part-Time Farm [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 155,627 | 131,889 |  |
Financing Receivable, Individually Evaluated for Impairment | 806 | 915 |  |
Financing Receivable, Gross | 156,433 | 132,804 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 48 | 54 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 20 | 26 |  |
Financing Receivable, Allowance for Credit Losses | 68 | 80 |  |
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 45,738 | 36,506 |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Gross | 45,738 | 36,506 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 562 | 511 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses | 562 | 511 |  |
Off-balance sheet [Member] | Other Commodity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 4,981 | 4,503 |  |
Financing Receivable, Individually Evaluated for Impairment | 76 | 0 |  |
Financing Receivable, Gross | 5,057 | 4,503 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 5 | 6 |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2 | 0 |  |
Financing Receivable, Allowance for Credit Losses | 7 | 6 |  |
Allowance for Loan and Lease Losses [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Financing Receivable, Allowance for Credit Losses, Write-downs | $ (327) | $ (130) | $ (3,772) |

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