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Loans and Allowance for Losses and Concentrations of Credit Risk - Allowance for Losses by Impairment Method and Commodity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment $ 6,882,755,000   $ 6,882,755,000     $ 6,720,503,000    
Financing Receivable, Individually Evaluated for Impairment 162,642,000   162,642,000     147,083,000    
Financing Receivable, Gross 7,045,397,000   7,045,397,000     6,867,586,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 6,009,000   6,009,000     5,982,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 3,029,000   3,029,000     2,884,000    
Financing Receivable, Allowance for Credit Losses 9,038,000 $ 8,104,000 9,038,000 $ 8,104,000 $ 8,456,000 8,866,000 $ 7,638,000 $ 7,435,000
Total provision for losses 582,000 466,000 172,000 910,000        
Financing Receivable, Allowance for Credit Losses, Write-downs     0 (241,000)        
Crops [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 3,681,079,000   3,681,079,000     3,581,213,000    
Financing Receivable, Individually Evaluated for Impairment 76,824,000   76,824,000     76,732,000    
Financing Receivable, Gross 3,757,903,000   3,757,903,000     3,657,945,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,882,000   2,882,000     2,650,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,243,000   1,243,000     1,431,000    
Financing Receivable, Allowance for Credit Losses 4,125,000 3,735,000 4,125,000 3,735,000 3,793,000 4,081,000 3,562,000 3,365,000
Total provision for losses 332,000 173,000 44,000 598,000        
Financing Receivable, Allowance for Credit Losses, Write-downs       (228,000)        
Permanent Plantings [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 1,338,411,000   1,338,411,000     1,327,144,000    
Financing Receivable, Individually Evaluated for Impairment 53,430,000   53,430,000     40,419,000    
Financing Receivable, Gross 1,391,841,000   1,391,841,000     1,367,563,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,100,000   1,100,000     1,406,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,268,000   1,268,000     1,063,000    
Financing Receivable, Allowance for Credit Losses 2,368,000 2,164,000 2,368,000 2,164,000 2,479,000 2,469,000 1,870,000 1,723,000
Total provision for losses (111,000) 294,000 (101,000) 441,000        
Financing Receivable, Allowance for Credit Losses, Write-downs       0        
Livestock [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 1,331,945,000   1,331,945,000     1,314,410,000    
Financing Receivable, Individually Evaluated for Impairment 22,918,000   22,918,000     20,548,000    
Financing Receivable, Gross 1,354,863,000   1,354,863,000     1,334,958,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 953,000   953,000     969,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 369,000   369,000     242,000    
Financing Receivable, Allowance for Credit Losses 1,322,000 1,234,000 1,322,000 1,234,000 1,236,000 1,211,000 1,379,000 1,375,000
Total provision for losses 86,000 (145,000) 111,000 (128,000)        
Financing Receivable, Allowance for Credit Losses, Write-downs       (13,000)        
Part-Time Farm [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 454,591,000   454,591,000     424,964,000    
Financing Receivable, Individually Evaluated for Impairment 9,397,000   9,397,000     8,664,000    
Financing Receivable, Gross 463,988,000   463,988,000     433,628,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 325,000   325,000     335,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 123,000   123,000     146,000    
Financing Receivable, Allowance for Credit Losses 448,000 397,000 448,000 397,000 413,000 481,000 324,000 405,000
Total provision for losses 35,000 73,000 (33,000) (8,000)        
Financing Receivable, Allowance for Credit Losses, Write-downs       0        
Agriculture Storage and Processing [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 68,558,000   68,558,000     58,761,000    
Financing Receivable, Individually Evaluated for Impairment 0   0     0    
Financing Receivable, Gross 68,558,000   68,558,000     58,761,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 720,000   720,000     606,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0     0    
Financing Receivable, Allowance for Credit Losses 720,000 558,000 720,000 558,000 522,000 606,000 472,000 533,000
Total provision for losses 198,000 86,000 114,000 25,000        
Financing Receivable, Allowance for Credit Losses, Write-downs       0        
Other Commodity [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 8,171,000   8,171,000     14,011,000    
Financing Receivable, Individually Evaluated for Impairment 73,000   73,000     720,000    
Financing Receivable, Gross 8,244,000   8,244,000     14,731,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 29,000   29,000     16,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 26,000   26,000     2,000    
Financing Receivable, Allowance for Credit Losses 55,000 16,000 55,000 16,000 $ 13,000 18,000 $ 31,000 $ 34,000
Total provision for losses 42,000 (15,000) 37,000 (18,000)        
Financing Receivable, Allowance for Credit Losses, Write-downs       0        
On-balance sheet [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 4,247,335,000   4,247,335,000     4,066,457,000    
Financing Receivable, Individually Evaluated for Impairment 131,623,000   131,623,000     132,276,000    
Financing Receivable, Gross 4,378,958,000   4,378,958,000     4,198,733,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4,224,000   4,224,000     4,285,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,565,000   2,565,000     2,511,000    
Financing Receivable, Allowance for Credit Losses 6,789,000   6,789,000     6,796,000    
On-balance sheet [Member] | Crops [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 2,424,914,000   2,424,914,000     2,344,821,000    
Financing Receivable, Individually Evaluated for Impairment 65,878,000   65,878,000     67,828,000    
Financing Receivable, Gross 2,490,792,000   2,490,792,000     2,412,649,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,260,000   2,260,000     2,104,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 987,000   987,000     1,207,000    
Financing Receivable, Allowance for Credit Losses 3,247,000   3,247,000     3,311,000    
On-balance sheet [Member] | Permanent Plantings [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 837,083,000   837,083,000     794,478,000    
Financing Receivable, Individually Evaluated for Impairment 40,694,000   40,694,000     38,180,000    
Financing Receivable, Gross 877,777,000   877,777,000     832,658,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 918,000   918,000     1,101,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,211,000   1,211,000     1,006,000    
Financing Receivable, Allowance for Credit Losses 2,129,000   2,129,000     2,107,000    
On-balance sheet [Member] | Livestock [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 677,830,000   677,830,000     635,768,000    
Financing Receivable, Individually Evaluated for Impairment 16,558,000   16,558,000     17,766,000    
Financing Receivable, Gross 694,388,000   694,388,000     653,534,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 741,000   741,000     738,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 241,000   241,000     172,000    
Financing Receivable, Allowance for Credit Losses 982,000   982,000     910,000    
On-balance sheet [Member] | Part-Time Farm [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 292,445,000   292,445,000     269,337,000    
Financing Receivable, Individually Evaluated for Impairment 8,493,000   8,493,000     7,858,000    
Financing Receivable, Gross 300,938,000   300,938,000     277,195,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 271,000   271,000     287,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 101,000   101,000     126,000    
Financing Receivable, Allowance for Credit Losses 372,000   372,000     413,000    
On-balance sheet [Member] | Agriculture Storage and Processing [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 10,496,000   10,496,000     13,023,000    
Financing Receivable, Individually Evaluated for Impairment 0   0     0    
Financing Receivable, Gross 10,496,000   10,496,000     13,023,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 10,000   10,000     44,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0     0    
Financing Receivable, Allowance for Credit Losses 10,000   10,000     44,000    
On-balance sheet [Member] | Other Commodity [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 4,567,000   4,567,000     9,030,000    
Financing Receivable, Individually Evaluated for Impairment 0   0     644,000    
Financing Receivable, Gross 4,567,000   4,567,000     9,674,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 24,000   24,000     11,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 25,000   25,000     0    
Financing Receivable, Allowance for Credit Losses 49,000   49,000     11,000    
Off-balance sheet [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 2,635,420,000   2,635,420,000     2,654,046,000    
Financing Receivable, Individually Evaluated for Impairment 31,019,000   31,019,000     14,807,000    
Financing Receivable, Gross 2,666,439,000   2,666,439,000     2,668,853,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,785,000   1,785,000     1,697,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 464,000   464,000     373,000    
Financing Receivable, Allowance for Credit Losses 2,249,000   2,249,000     2,070,000    
Off-balance sheet [Member] | Crops [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 1,256,165,000   1,256,165,000     1,236,392,000    
Financing Receivable, Individually Evaluated for Impairment 10,946,000   10,946,000     8,904,000    
Financing Receivable, Gross 1,267,111,000   1,267,111,000     1,245,296,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 622,000   622,000     546,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 256,000   256,000     224,000    
Financing Receivable, Allowance for Credit Losses 878,000   878,000     770,000    
Off-balance sheet [Member] | Permanent Plantings [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 501,328,000   501,328,000     532,666,000    
Financing Receivable, Individually Evaluated for Impairment 12,736,000   12,736,000     2,239,000    
Financing Receivable, Gross 514,064,000   514,064,000     534,905,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 182,000   182,000     305,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 57,000   57,000     57,000    
Financing Receivable, Allowance for Credit Losses 239,000   239,000     362,000    
Off-balance sheet [Member] | Livestock [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 654,115,000   654,115,000     678,642,000    
Financing Receivable, Individually Evaluated for Impairment 6,360,000   6,360,000     2,782,000    
Financing Receivable, Gross 660,475,000   660,475,000     681,424,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 212,000   212,000     231,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 128,000   128,000     70,000    
Financing Receivable, Allowance for Credit Losses 340,000   340,000     301,000    
Off-balance sheet [Member] | Part-Time Farm [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 162,146,000   162,146,000     155,627,000    
Financing Receivable, Individually Evaluated for Impairment 904,000   904,000     806,000    
Financing Receivable, Gross 163,050,000   163,050,000     156,433,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 54,000   54,000     48,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 22,000   22,000     20,000    
Financing Receivable, Allowance for Credit Losses 76,000   76,000     68,000    
Off-balance sheet [Member] | Agriculture Storage and Processing [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 58,062,000   58,062,000     45,738,000    
Financing Receivable, Individually Evaluated for Impairment 0   0     0    
Financing Receivable, Gross 58,062,000   58,062,000     45,738,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 710,000   710,000     562,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0     0    
Financing Receivable, Allowance for Credit Losses 710,000   710,000     562,000    
Off-balance sheet [Member] | Other Commodity [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 3,604,000   3,604,000     4,981,000    
Financing Receivable, Individually Evaluated for Impairment 73,000   73,000     76,000    
Financing Receivable, Gross 3,677,000   3,677,000     5,057,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5,000   5,000     5,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,000   1,000     2,000    
Financing Receivable, Allowance for Credit Losses 6,000   6,000     $ 7,000    
Allowance for Loan and Lease Losses [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Allowance for Credit Losses, Write-downs $ 0 $ 0 $ 0 $ (241,000)