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Loans and Allowance for Losses and Concentrations of Credit Risk - Financing Receivables Credit Quality Indicators (Details) - USD ($)
 6 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 177,033 $ 10,900,000    
Financing Receivable, Modifications, Pre-Modification Recorded Investment     10,900,000 $ 200,000  
Financing Receivable, Gross     7,072,018,000   $ 6,867,586,000
Financing Receivable, Recorded Investment, Past Due     37,545,000   48,444,000
Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     6,592,432,000   6,390,271,000
Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     263,563,000   256,008,000
Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     216,023,000   221,307,000
Crops [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     3,746,077,000   3,657,945,000
Financing Receivable, Recorded Investment, Past Due     16,989,000   21,853,000
Crops [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     3,487,351,000   3,407,108,000
Crops [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     143,485,000   146,841,000
Crops [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     115,241,000   103,996,000
Permanent Plantings [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     1,400,976,000   1,367,563,000
Financing Receivable, Recorded Investment, Past Due     9,340,000   18,833,000
Permanent Plantings [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     1,302,801,000   1,250,173,000
Permanent Plantings [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     49,266,000   49,012,000
Permanent Plantings [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     48,909,000   68,378,000
Livestock [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     1,353,141,000   1,334,958,000
Financing Receivable, Recorded Investment, Past Due     6,763,000   3,835,000
Livestock [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     1,252,843,000   1,252,160,000
Livestock [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     63,034,000   49,856,000
Livestock [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     37,264,000   32,942,000
Part-Time Farm [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     484,227,000   433,628,000
Financing Receivable, Recorded Investment, Past Due     4,453,000   3,923,000
Part-Time Farm [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     463,914,000   411,760,000
Part-Time Farm [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     7,778,000   10,130,000
Part-Time Farm [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     12,535,000   11,738,000
Agriculture Storage and Processing [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     79,475,000   58,761,000
Financing Receivable, Recorded Investment, Past Due     0   0
Agriculture Storage and Processing [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     78,111,000   55,746,000
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     1,364,000   3,015,000
Other Commodity [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     8,122,000   14,731,000
Financing Receivable, Recorded Investment, Past Due     0   0
Other Commodity [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     7,412,000   13,324,000
Other Commodity [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     0   169,000
Other Commodity [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     710,000   1,238,000
On-balance sheet [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     4,420,619,000   4,198,733,000
Financing Receivable, Recorded Investment, Past Due     32,756,000   47,881,000
On-balance sheet [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     4,173,928,000   3,946,946,000
On-balance sheet [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     118,899,000   119,829,000
On-balance sheet [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     127,792,000   131,958,000
On-balance sheet [Member] | Crops [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     2,492,489,000   2,412,649,000
Financing Receivable, Recorded Investment, Past Due     15,843,000   21,702,000
On-balance sheet [Member] | Crops [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     2,355,938,000   2,274,912,000
On-balance sheet [Member] | Crops [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     72,974,000   70,063,000
On-balance sheet [Member] | Crops [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     63,577,000   67,674,000
On-balance sheet [Member] | Permanent Plantings [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     894,818,000   832,658,000
Financing Receivable, Recorded Investment, Past Due     7,822,000   18,833,000
On-balance sheet [Member] | Permanent Plantings [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     847,666,000   771,600,000
On-balance sheet [Member] | Permanent Plantings [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     13,204,000   22,878,000
On-balance sheet [Member] | Permanent Plantings [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     33,948,000   38,180,000
On-balance sheet [Member] | Livestock [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     701,185,000   653,534,000
Financing Receivable, Recorded Investment, Past Due     5,274,000   3,835,000
On-balance sheet [Member] | Livestock [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     652,715,000   617,527,000
On-balance sheet [Member] | Livestock [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     25,729,000   18,405,000
On-balance sheet [Member] | Livestock [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     22,741,000   17,602,000
On-balance sheet [Member] | Part-Time Farm [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     316,761,000   277,195,000
Financing Receivable, Recorded Investment, Past Due     3,817,000   3,511,000
On-balance sheet [Member] | Part-Time Farm [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     302,243,000   260,854,000
On-balance sheet [Member] | Part-Time Farm [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     6,992,000   8,483,000
On-balance sheet [Member] | Part-Time Farm [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     7,526,000   7,858,000
On-balance sheet [Member] | Agriculture Storage and Processing [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     10,824,000   13,023,000
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     10,824,000   13,023,000
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     4,542,000   9,674,000
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     4,542,000   9,030,000
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     0   644,000
Off-balance sheet [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     2,651,399,000   2,668,853,000
Financing Receivable, Recorded Investment, Past Due     4,789,000   563,000
Off-balance sheet [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     2,418,504,000   2,443,325,000
Off-balance sheet [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     144,664,000   136,179,000
Off-balance sheet [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     88,231,000   89,349,000
Off-balance sheet [Member] | Crops [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     1,253,588,000   1,245,296,000
Financing Receivable, Recorded Investment, Past Due     1,146,000   151,000
Off-balance sheet [Member] | Crops [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     1,131,413,000   1,132,196,000
Off-balance sheet [Member] | Crops [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     70,511,000   76,778,000
Off-balance sheet [Member] | Crops [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     51,664,000   36,322,000
Off-balance sheet [Member] | Permanent Plantings [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     506,158,000   534,905,000
Financing Receivable, Recorded Investment, Past Due     1,518,000   0
Off-balance sheet [Member] | Permanent Plantings [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     455,135,000   478,573,000
Off-balance sheet [Member] | Permanent Plantings [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     36,062,000   26,134,000
Off-balance sheet [Member] | Permanent Plantings [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     14,961,000   30,198,000
Off-balance sheet [Member] | Livestock [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     651,956,000   681,424,000
Financing Receivable, Recorded Investment, Past Due     1,489,000   0
Off-balance sheet [Member] | Livestock [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     600,128,000   634,633,000
Off-balance sheet [Member] | Livestock [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     37,305,000   31,451,000
Off-balance sheet [Member] | Livestock [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     14,523,000   15,340,000
Off-balance sheet [Member] | Part-Time Farm [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     167,466,000   156,433,000
Financing Receivable, Recorded Investment, Past Due     636,000   412,000
Off-balance sheet [Member] | Part-Time Farm [Member] | Acceptable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     161,671,000   150,906,000
Off-balance sheet [Member] | Part-Time Farm [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     786,000   1,647,000
Off-balance sheet [Member] | Part-Time Farm [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     5,009,000   3,880,000
Off-balance sheet [Member] | Agriculture Storage and Processing [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     68,651,000   45,738,000
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     67,287,000   42,723,000
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     1,364,000   3,015,000
Off-balance sheet [Member] | Other Commodity [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     3,580,000   5,057,000
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     2,870,000   4,294,000
Off-balance sheet [Member] | Other Commodity [Member] | Special Mention [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     0   169,000
Off-balance sheet [Member] | Other Commodity [Member] | Substandard [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Gross     $ 710,000   $ 594,000