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Loans and Allowance for Losses - Schedule of Allowance for Losses by Impairment Method and Commodity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | $ 7,172,973 |  | $ 7,079,331 |  |  |
Individually evaluated for impairment: | 220,755 |  | 154,640 |  |  |
Total Farm & Ranch loans: | 7,393,728 |  | 7,233,971 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 4,975 |  | 5,779 |  |  |
Individually evaluated for impairment: | 4,792 |  | 3,405 |  |  |
Total Farm & Ranch loans: | 9,767 | $ 9,144 | 9,184 | $ 9,018 | $ 9,038 | $ 8,866
Crops [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 3,682,001 |  | 3,691,897 |  |  |
Individually evaluated for impairment: | 113,613 |  | 79,730 |  |  |
Total Farm & Ranch loans: | 3,795,614 |  | 3,771,627 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 2,285 |  | 2,788 |  |  |
Individually evaluated for impairment: | 2,576 |  | 1,606 |  |  |
Total Farm & Ranch loans: | 4,861 | 4,773 | 4,394 | 4,026 | 4,125 | 4,081
Permanent Plantings [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 1,563,550 |  | 1,468,239 |  |  |
Individually evaluated for impairment: | 51,347 |  | 41,582 |  |  |
Total Farm & Ranch loans: | 1,614,897 |  | 1,509,821 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 991 |  | 992 |  |  |
Individually evaluated for impairment: | 1,114 |  | 1,134 |  |  |
Total Farm & Ranch loans: | 2,105 | 1,926 | 2,126 | 2,408 | 2,368 | 2,469
Livestock [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 1,344,358 |  | 1,330,274 |  |  |
Individually evaluated for impairment: | 47,321 |  | 25,098 |  |  |
Total Farm & Ranch loans: | 1,391,679 |  | 1,355,372 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 844 |  | 938 |  |  |
Individually evaluated for impairment: | 983 |  | 522 |  |  |
Total Farm & Ranch loans: | 1,827 | 1,423 | 1,460 | 1,470 | 1,322 | 1,211
Part-Time Farm [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 499,843 |  | 495,977 |  |  |
Individually evaluated for impairment: | 8,417 |  | 8,161 |  |  |
Total Farm & Ranch loans: | 508,260 |  | 504,138 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 265 |  | 332 |  |  |
Individually evaluated for impairment: | 119 |  | 142 |  |  |
Total Farm & Ranch loans: | 384 | 400 | 474 | 481 | 448 | 481
Agriculture Storage and Processing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 78,941 |  | 85,181 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 78,941 |  | 85,181 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 585 |  | 720 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 585 | 603 | 720 | 623 | 720 | 606
Other Commodity [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 4,280 |  | 7,763 |  |  |
Individually evaluated for impairment: | 57 |  | 69 |  |  |
Total Farm & Ranch loans: | 4,337 |  | 7,832 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 5 |  | 9 |  |  |
Individually evaluated for impairment: | 0 |  | 1 |  |  |
Total Farm & Ranch loans: | 5 | $ 19 | 10 | $ 10 | $ 55 | $ 18
On-balance sheet [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 4,628,193 |  | 4,456,918 |  |  |
Individually evaluated for impairment: | 208,773 |  | 131,404 |  |  |
Total Farm & Ranch loans: | 4,836,966 |  | 4,588,322 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 3,435 |  | 4,064 |  |  |
Individually evaluated for impairment: | 4,589 |  | 2,953 |  |  |
Total Farm & Ranch loans: | 8,024 |  | 7,017 |  |  |
On-balance sheet [Member] | Crops [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 2,494,029 |  | 2,452,803 |  |  |
Individually evaluated for impairment: | 108,497 |  | 66,432 |  |  |
Total Farm & Ranch loans: | 2,602,526 |  | 2,519,235 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 1,729 |  | 2,120 |  |  |
Individually evaluated for impairment: | 2,495 |  | 1,329 |  |  |
Total Farm & Ranch loans: | 4,224 |  | 3,449 |  |  |
On-balance sheet [Member] | Permanent Plantings [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 1,043,626 |  | 952,719 |  |  |
Individually evaluated for impairment: | 49,225 |  | 36,333 |  |  |
Total Farm & Ranch loans: | 1,092,851 |  | 989,052 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 885 |  | 822 |  |  |
Individually evaluated for impairment: | 1,070 |  | 1,065 |  |  |
Total Farm & Ranch loans: | 1,955 |  | 1,887 |  |  |
On-balance sheet [Member] | Livestock [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 738,936 |  | 705,752 |  |  |
Individually evaluated for impairment: | 43,346 |  | 21,361 |  |  |
Total Farm & Ranch loans: | 782,282 |  | 727,113 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 550 |  | 731 |  |  |
Individually evaluated for impairment: | 920 |  | 437 |  |  |
Total Farm & Ranch loans: | 1,470 |  | 1,168 |  |  |
On-balance sheet [Member] | Part-Time Farm [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 338,798 |  | 329,070 |  |  |
Individually evaluated for impairment: | 7,705 |  | 7,278 |  |  |
Total Farm & Ranch loans: | 346,503 |  | 336,348 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 242 |  | 303 |  |  |
Individually evaluated for impairment: | 104 |  | 122 |  |  |
Total Farm & Ranch loans: | 346 |  | 425 |  |  |
On-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 11,379 |  | 12,097 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 11,379 |  | 12,097 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 28 |  | 84 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 28 |  | 84 |  |  |
On-balance sheet [Member] | Other Commodity [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 1,425 |  | 4,477 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 1,425 |  | 4,477 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 1 |  | 4 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 1 |  | 4 |  |  |
Off-balance sheet [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 2,544,780 |  | 2,622,413 |  |  |
Individually evaluated for impairment: | 11,982 |  | 23,236 |  |  |
Total Farm & Ranch loans: | 2,556,762 |  | 2,645,649 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 1,540 |  | 1,715 |  |  |
Individually evaluated for impairment: | 203 |  | 452 |  |  |
Total Farm & Ranch loans: | 1,743 |  | 2,167 |  |  |
Off-balance sheet [Member] | Crops [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 1,187,972 |  | 1,239,094 |  |  |
Individually evaluated for impairment: | 5,116 |  | 13,298 |  |  |
Total Farm & Ranch loans: | 1,193,088 |  | 1,252,392 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 556 |  | 668 |  |  |
Individually evaluated for impairment: | 81 |  | 277 |  |  |
Total Farm & Ranch loans: | 637 |  | 945 |  |  |
Off-balance sheet [Member] | Permanent Plantings [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 519,924 |  | 515,520 |  |  |
Individually evaluated for impairment: | 2,122 |  | 5,249 |  |  |
Total Farm & Ranch loans: | 522,046 |  | 520,769 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 106 |  | 170 |  |  |
Individually evaluated for impairment: | 44 |  | 69 |  |  |
Total Farm & Ranch loans: | 150 |  | 239 |  |  |
Off-balance sheet [Member] | Livestock [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 605,422 |  | 624,522 |  |  |
Individually evaluated for impairment: | 3,975 |  | 3,737 |  |  |
Total Farm & Ranch loans: | 609,397 |  | 628,259 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 294 |  | 207 |  |  |
Individually evaluated for impairment: | 63 |  | 85 |  |  |
Total Farm & Ranch loans: | 357 |  | 292 |  |  |
Off-balance sheet [Member] | Part-Time Farm [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 161,045 |  | 166,907 |  |  |
Individually evaluated for impairment: | 712 |  | 883 |  |  |
Total Farm & Ranch loans: | 161,757 |  | 167,790 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 23 |  | 29 |  |  |
Individually evaluated for impairment: | 15 |  | 20 |  |  |
Total Farm & Ranch loans: | 38 |  | 49 |  |  |
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 67,562 |  | 73,084 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 67,562 |  | 73,084 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 557 |  | 636 |  |  |
Individually evaluated for impairment: | 0 |  | 0 |  |  |
Total Farm & Ranch loans: | 557 |  | 636 |  |  |
Off-balance sheet [Member] | Other Commodity [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |  |
Collectively evaluated for impairment: | 2,855 |  | 3,286 |  |  |
Individually evaluated for impairment: | 57 |  | 69 |  |  |
Total Farm & Ranch loans: | 2,912 |  | 3,355 |  |  |
Allowance for Losses: |  |  |  |  |  |
Collectively evaluated for impairment: | 4 |  | 5 |  |  |
Individually evaluated for impairment: | 0 |  | 1 |  |  |
Total Farm & Ranch loans: | $ 4 |  | $ 6 |  |  |

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