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Loans and Allowance for Losses and Concentrations of Credit Risk - Financing Receivables Credit Quality Indicators (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | $ 6,867,586 | $ 6,139,304
Financing Receivable, Recorded Investment, Past Due | 48,444 | 21,038
Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 6,390,271 | 5,845,308
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 256,008 | 128,803
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 221,307 | 165,193
Crops [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,657,945 | 3,410,498
Financing Receivable, Recorded Investment, Past Due | 21,853 | 13,822
Crops [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,407,108 | 3,281,371
Crops [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 146,841 | 55,645
Crops [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 103,996 | 73,482
Permanent Plantings [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,367,563 | 1,037,440
Financing Receivable, Recorded Investment, Past Due | 18,833 | 3,652
Permanent Plantings [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,250,173 | 971,477
Permanent Plantings [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 49,012 | 18,020
Permanent Plantings [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 68,378 | 47,943
Livestock [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,334,958 | 1,305,844
Financing Receivable, Recorded Investment, Past Due | 3,835 | 707
Livestock [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,252,160 | 1,228,840
Livestock [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 49,856 | 48,416
Livestock [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 32,942 | 28,588
Part-Time Farm [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 433,628 | 324,074
Financing Receivable, Recorded Investment, Past Due | 3,923 | 2,857
Part-Time Farm [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 411,760 | 304,728
Part-Time Farm [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 10,130 | 6,716
Part-Time Farm [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 11,738 | 12,630
Agriculture Storage and Processing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 58,761 | 48,051
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Agriculture Storage and Processing [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 55,746 | 46,082
Agriculture Storage and Processing [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
Agriculture Storage and Processing [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,015 | 1,969
Other Commodity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 14,731 | 13,397
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Other Commodity [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 13,324 | 12,810
Other Commodity [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 169 | 6
Other Commodity [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,238 | 581
On-balance sheet [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 4,198,733 | 3,514,454
Financing Receivable, Recorded Investment, Past Due | 47,881 | 19,757
On-balance sheet [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,946,946 | 3,352,959
On-balance sheet [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 119,829 | 73,809
On-balance sheet [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 131,958 | 87,686
On-balance sheet [Member] | Crops [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 2,412,649 | 2,157,098
Financing Receivable, Recorded Investment, Past Due | 21,702 | 13,449
On-balance sheet [Member] | Crops [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 2,274,912 | 2,080,227
On-balance sheet [Member] | Crops [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 70,063 | 35,223
On-balance sheet [Member] | Crops [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 67,674 | 41,648
On-balance sheet [Member] | Permanent Plantings [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 832,658 | 597,130
Financing Receivable, Recorded Investment, Past Due | 18,833 | 3,245
On-balance sheet [Member] | Permanent Plantings [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 771,600 | 568,221
On-balance sheet [Member] | Permanent Plantings [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 22,878 | 1,139
On-balance sheet [Member] | Permanent Plantings [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 38,180 | 27,770
On-balance sheet [Member] | Livestock [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 653,534 | 548,517
Financing Receivable, Recorded Investment, Past Due | 3,835 | 669
On-balance sheet [Member] | Livestock [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 617,527 | 504,784
On-balance sheet [Member] | Livestock [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 18,405 | 33,075
On-balance sheet [Member] | Livestock [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 17,602 | 10,658
On-balance sheet [Member] | Part-Time Farm [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 277,195 | 191,270
Financing Receivable, Recorded Investment, Past Due | 3,511 | 2,394
On-balance sheet [Member] | Part-Time Farm [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 260,854 | 179,288
On-balance sheet [Member] | Part-Time Farm [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 8,483 | 4,372
On-balance sheet [Member] | Part-Time Farm [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 7,858 | 7,610
On-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 13,023 | 11,545
Financing Receivable, Recorded Investment, Past Due | 0 | 0
On-balance sheet [Member] | Agriculture Storage and Processing [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 13,023 | 11,545
On-balance sheet [Member] | Agriculture Storage and Processing [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
On-balance sheet [Member] | Agriculture Storage and Processing [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
On-balance sheet [Member] | Other Commodity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 9,674 | 8,894
Financing Receivable, Recorded Investment, Past Due | 0 | 0
On-balance sheet [Member] | Other Commodity [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 9,030 | 8,894
On-balance sheet [Member] | Other Commodity [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
On-balance sheet [Member] | Other Commodity [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 644 | 0
Off-balance sheet [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 2,668,853 | 2,624,850
Financing Receivable, Recorded Investment, Past Due | 563 | 1,281
Off-balance sheet [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 2,443,325 | 2,492,349
Off-balance sheet [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 136,179 | 54,994
Off-balance sheet [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 89,349 | 77,507
Off-balance sheet [Member] | Crops [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,245,296 | 1,253,400
Financing Receivable, Recorded Investment, Past Due | 151 | 373
Off-balance sheet [Member] | Crops [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,132,196 | 1,201,144
Off-balance sheet [Member] | Crops [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 76,778 | 20,422
Off-balance sheet [Member] | Crops [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 36,322 | 31,834
Off-balance sheet [Member] | Permanent Plantings [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 534,905 | 440,310
Financing Receivable, Recorded Investment, Past Due | 0 | 407
Off-balance sheet [Member] | Permanent Plantings [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 478,573 | 403,256
Off-balance sheet [Member] | Permanent Plantings [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 26,134 | 16,881
Off-balance sheet [Member] | Permanent Plantings [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 30,198 | 20,173
Off-balance sheet [Member] | Livestock [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 681,424 | 757,327
Financing Receivable, Recorded Investment, Past Due | 0 | 38
Off-balance sheet [Member] | Livestock [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 634,633 | 724,056
Off-balance sheet [Member] | Livestock [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 31,451 | 15,341
Off-balance sheet [Member] | Livestock [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 15,340 | 17,930
Off-balance sheet [Member] | Part-Time Farm [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 156,433 | 132,804
Financing Receivable, Recorded Investment, Past Due | 412 | 463
Off-balance sheet [Member] | Part-Time Farm [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 150,906 | 125,440
Off-balance sheet [Member] | Part-Time Farm [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,647 | 2,344
Off-balance sheet [Member] | Part-Time Farm [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,880 | 5,020
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 45,738 | 36,506
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 42,723 | 34,537
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,015 | 1,969
Off-balance sheet [Member] | Other Commodity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 5,057 | 4,503
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Off-balance sheet [Member] | Other Commodity [Member] | Acceptable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 4,294 | 3,916
Off-balance sheet [Member] | Other Commodity [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 169 | 6
Off-balance sheet [Member] | Other Commodity [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | $ 594 | $ 581

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