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Loans and Allowance for Losses - Schedule of Allowance for Losses by Impairment Method and Commodity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | $ 7,041,104 | $ 7,079,331 |  |
Individually evaluated for impairment: | 174,481 | 154,640 |  |
Total Farm & Ranch loans: | 7,215,585 | 7,233,971 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 5,465 | 5,779 |  |
Individually evaluated for impairment: | 3,326 | 3,405 |  |
Total Farm & Ranch loans: | 8,791 | 9,184 | $ 8,456 | $ 8,866
Crops [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 3,666,405 | 3,691,897 |  |
Individually evaluated for impairment: | 97,051 | 79,730 |  |
Total Farm & Ranch loans: | 3,763,456 | 3,771,627 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 2,483 | 2,788 |  |
Individually evaluated for impairment: | 1,750 | 1,606 |  |
Total Farm & Ranch loans: | 4,233 | 4,394 | 3,793 | 4,081
Permanent Plantings [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 1,453,217 | 1,468,239 |  |
Individually evaluated for impairment: | 39,142 | 41,582 |  |
Total Farm & Ranch loans: | 1,492,359 | 1,509,821 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 1,066 | 992 |  |
Individually evaluated for impairment: | 868 | 1,134 |  |
Total Farm & Ranch loans: | 1,934 | 2,126 | 2,479 | 2,469
Livestock [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 1,319,630 | 1,330,274 |  |
Individually evaluated for impairment: | 30,980 | 25,098 |  |
Total Farm & Ranch loans: | 1,350,610 | 1,355,372 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 867 | 938 |  |
Individually evaluated for impairment: | 585 | 522 |  |
Total Farm & Ranch loans: | 1,452 | 1,460 | 1,236 | 1,211
Part-Time Farm [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 509,862 | 495,977 |  |
Individually evaluated for impairment: | 7,248 | 8,161 |  |
Total Farm & Ranch loans: | 517,110 | 504,138 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 291 | 332 |  |
Individually evaluated for impairment: | 122 | 142 |  |
Total Farm & Ranch loans: | 413 | 474 | 413 | 481
Agriculture Storage and Processing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 84,321 | 85,181 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 84,321 | 85,181 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 737 | 720 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 737 | 720 | 522 | 606
Other Commodity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 7,669 | 7,763 |  |
Individually evaluated for impairment: | 60 | 69 |  |
Total Farm & Ranch loans: | 7,729 | 7,832 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 21 | 9 |  |
Individually evaluated for impairment: | 1 | 1 |  |
Total Farm & Ranch loans: | 22 | 10 | $ 13 | $ 18
On-balance sheet [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 4,454,370 | 4,456,918 |  |
Individually evaluated for impairment: | 156,527 | 131,404 |  |
Total Farm & Ranch loans: | 4,610,897 | 4,588,322 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 3,772 | 4,064 |  |
Individually evaluated for impairment: | 2,981 | 2,953 |  |
Total Farm & Ranch loans: | 6,753 | 7,017 |  |
On-balance sheet [Member] | Crops [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 2,450,803 | 2,452,803 |  |
Individually evaluated for impairment: | 86,299 | 66,432 |  |
Total Farm & Ranch loans: | 2,537,102 | 2,519,235 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 1,818 | 2,120 |  |
Individually evaluated for impairment: | 1,551 | 1,329 |  |
Total Farm & Ranch loans: | 3,369 | 3,449 |  |
On-balance sheet [Member] | Permanent Plantings [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 946,435 | 952,719 |  |
Individually evaluated for impairment: | 36,785 | 36,333 |  |
Total Farm & Ranch loans: | 983,220 | 989,052 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 958 | 822 |  |
Individually evaluated for impairment: | 816 | 1,065 |  |
Total Farm & Ranch loans: | 1,774 | 1,887 |  |
On-balance sheet [Member] | Livestock [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 699,333 | 705,752 |  |
Individually evaluated for impairment: | 27,064 | 21,361 |  |
Total Farm & Ranch loans: | 726,397 | 727,113 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 631 | 731 |  |
Individually evaluated for impairment: | 511 | 437 |  |
Total Farm & Ranch loans: | 1,142 | 1,168 |  |
On-balance sheet [Member] | Part-Time Farm [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 341,177 | 329,070 |  |
Individually evaluated for impairment: | 6,379 | 7,278 |  |
Total Farm & Ranch loans: | 347,556 | 336,348 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 265 | 303 |  |
Individually evaluated for impairment: | 103 | 122 |  |
Total Farm & Ranch loans: | 368 | 425 |  |
On-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 12,036 | 12,097 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 12,036 | 12,097 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 84 | 84 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 84 | 84 |  |
On-balance sheet [Member] | Other Commodity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 4,586 | 4,477 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 4,586 | 4,477 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 16 | 4 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 16 | 4 |  |
Off-balance sheet [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 2,586,734 | 2,622,413 |  |
Individually evaluated for impairment: | 17,954 | 23,236 |  |
Total Farm & Ranch loans: | 2,604,688 | 2,645,649 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 1,693 | 1,715 |  |
Individually evaluated for impairment: | 345 | 452 |  |
Total Farm & Ranch loans: | 2,038 | 2,167 |  |
Off-balance sheet [Member] | Crops [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 1,215,602 | 1,239,094 |  |
Individually evaluated for impairment: | 10,752 | 13,298 |  |
Total Farm & Ranch loans: | 1,226,354 | 1,252,392 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 665 | 668 |  |
Individually evaluated for impairment: | 199 | 277 |  |
Total Farm & Ranch loans: | 864 | 945 |  |
Off-balance sheet [Member] | Permanent Plantings [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 506,782 | 515,520 |  |
Individually evaluated for impairment: | 2,357 | 5,249 |  |
Total Farm & Ranch loans: | 509,139 | 520,769 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 108 | 170 |  |
Individually evaluated for impairment: | 52 | 69 |  |
Total Farm & Ranch loans: | 160 | 239 |  |
Off-balance sheet [Member] | Livestock [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 620,297 | 624,522 |  |
Individually evaluated for impairment: | 3,916 | 3,737 |  |
Total Farm & Ranch loans: | 624,213 | 628,259 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 236 | 207 |  |
Individually evaluated for impairment: | 74 | 85 |  |
Total Farm & Ranch loans: | 310 | 292 |  |
Off-balance sheet [Member] | Part-Time Farm [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 168,685 | 166,907 |  |
Individually evaluated for impairment: | 869 | 883 |  |
Total Farm & Ranch loans: | 169,554 | 167,790 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 26 | 29 |  |
Individually evaluated for impairment: | 19 | 20 |  |
Total Farm & Ranch loans: | 45 | 49 |  |
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 72,285 | 73,084 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 72,285 | 73,084 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 653 | 636 |  |
Individually evaluated for impairment: | 0 | 0 |  |
Total Farm & Ranch loans: | 653 | 636 |  |
Off-balance sheet [Member] | Other Commodity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Collectively evaluated for impairment: | 3,083 | 3,286 |  |
Individually evaluated for impairment: | 60 | 69 |  |
Total Farm & Ranch loans: | 3,143 | 3,355 |  |
Allowance for Losses: |  |  |  |
Collectively evaluated for impairment: | 5 | 5 |  |
Individually evaluated for impairment: | 1 | 1 |  |
Total Farm & Ranch loans: | $ 6 | $ 6 |  |

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