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Loans and Allowance for Losses and Concentrations of Credit Risk - Allowance for Losses by Impairment Method and Commodity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment $ 6,925,943       $ 6,925,943   $ 6,720,503  
Financing Receivable, Individually Evaluated for Impairment 146,075       146,075   147,083  
Financing Receivable, Gross 7,072,018       7,072,018   6,867,586  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5,762       5,762   5,982  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 3,256       3,256   2,884  
Financing Receivable, Allowance for Credit Losses 9,018 $ 9,038 $ 8,488 $ 8,104 9,018 $ 8,488 8,866 $ 7,435
Total provision for losses (3)   384   169 1,294    
Financing Receivable, Allowance for Credit Losses, Write-downs (17) (17)   0 (17) (241)    
Crops [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 3,670,854       3,670,854   3,581,213  
Financing Receivable, Individually Evaluated for Impairment 75,223       75,223   76,732  
Financing Receivable, Gross 3,746,077       3,746,077   3,657,945  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,659       2,659   2,650  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,367       1,367   1,431  
Financing Receivable, Allowance for Credit Losses 4,026 4,125 3,850 3,735 4,026 3,850 4,081 3,365
Total provision for losses (99)   115   (55) 713    
Financing Receivable, Allowance for Credit Losses, Write-downs 0       0 (228)    
Permanent Plantings [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 1,364,654       1,364,654   1,327,144  
Financing Receivable, Individually Evaluated for Impairment 36,322       36,322   40,419  
Financing Receivable, Gross 1,400,976       1,400,976   1,367,563  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,146       1,146   1,406  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,262       1,262   1,063  
Financing Receivable, Allowance for Credit Losses 2,408 2,368 2,326 2,164 2,408 2,326 2,469 1,723
Total provision for losses 40   162   (61) 603    
Financing Receivable, Allowance for Credit Losses, Write-downs 0       0 0    
Livestock [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 1,327,104       1,327,104   1,314,410  
Financing Receivable, Individually Evaluated for Impairment 26,037       26,037   20,548  
Financing Receivable, Gross 1,353,141       1,353,141   1,334,958  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 976       976   969  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 494       494   242  
Financing Receivable, Allowance for Credit Losses 1,470 1,322 1,269 1,234 1,470 1,269 1,211 1,375
Total provision for losses 148   35   259 (93)    
Financing Receivable, Allowance for Credit Losses, Write-downs 0       0 (13)    
Part-Time Farm [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 475,805       475,805   424,964  
Financing Receivable, Individually Evaluated for Impairment 8,422       8,422   8,664  
Financing Receivable, Gross 484,227       484,227   433,628  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 349       349   335  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 132       132   146  
Financing Receivable, Allowance for Credit Losses 481 448 401 397 481 401 481 405
Total provision for losses 50   4   17 (4)    
Financing Receivable, Allowance for Credit Losses, Write-downs (17)       (17) 0    
Agriculture Storage and Processing [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 79,475       79,475   58,761  
Financing Receivable, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Gross 79,475       79,475   58,761  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 623       623   606  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Allowance for Credit Losses 623 720 630 558 623 630 606 533
Total provision for losses (97)   72   17 97    
Financing Receivable, Allowance for Credit Losses, Write-downs 0       0 0    
Other Commodity [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 8,051       8,051   14,011  
Financing Receivable, Individually Evaluated for Impairment 71       71   720  
Financing Receivable, Gross 8,122       8,122   14,731  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 9       9   16  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1       1   2  
Financing Receivable, Allowance for Credit Losses 10 $ 55 12 $ 16 10 12 18 $ 34
Total provision for losses (45)   (4)   (8) (22)    
Financing Receivable, Allowance for Credit Losses, Write-downs 0       0 0    
On-balance sheet [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 4,292,690       4,292,690   4,066,457  
Financing Receivable, Individually Evaluated for Impairment 127,929       127,929   132,276  
Financing Receivable, Gross 4,420,619       4,420,619   4,198,733  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4,080       4,080   4,285  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,791       2,791   2,511  
Financing Receivable, Allowance for Credit Losses 6,871       6,871   6,796  
On-balance sheet [Member] | Crops [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 2,428,763       2,428,763   2,344,821  
Financing Receivable, Individually Evaluated for Impairment 63,726       63,726   67,828  
Financing Receivable, Gross 2,492,489       2,492,489   2,412,649  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,047       2,047   2,104  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,112       1,112   1,207  
Financing Receivable, Allowance for Credit Losses 3,159       3,159   3,311  
On-balance sheet [Member] | Permanent Plantings [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 860,870       860,870   794,478  
Financing Receivable, Individually Evaluated for Impairment 33,948       33,948   38,180  
Financing Receivable, Gross 894,818       894,818   832,658  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 955       955   1,101  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,207       1,207   1,006  
Financing Receivable, Allowance for Credit Losses 2,162       2,162   2,107  
On-balance sheet [Member] | Livestock [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 678,456       678,456   635,768  
Financing Receivable, Individually Evaluated for Impairment 22,729       22,729   17,766  
Financing Receivable, Gross 701,185       701,185   653,534  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 765       765   738  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 361       361   172  
Financing Receivable, Allowance for Credit Losses 1,126       1,126   910  
On-balance sheet [Member] | Part-Time Farm [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 309,235       309,235   269,337  
Financing Receivable, Individually Evaluated for Impairment 7,526       7,526   7,858  
Financing Receivable, Gross 316,761       316,761   277,195  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 300       300   287  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 111       111   126  
Financing Receivable, Allowance for Credit Losses 411       411   413  
On-balance sheet [Member] | Agriculture Storage and Processing [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 10,824       10,824   13,023  
Financing Receivable, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Gross 10,824       10,824   13,023  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 9       9   44  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Allowance for Credit Losses 9       9   44  
On-balance sheet [Member] | Other Commodity [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 4,542       4,542   9,030  
Financing Receivable, Individually Evaluated for Impairment 0       0   644  
Financing Receivable, Gross 4,542       4,542   9,674  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4       4   11  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Allowance for Credit Losses 4       4   11  
Off-balance sheet [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 2,633,253       2,633,253   2,654,046  
Financing Receivable, Individually Evaluated for Impairment 18,146       18,146   14,807  
Financing Receivable, Gross 2,651,399       2,651,399   2,668,853  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,682       1,682   1,697  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 465       465   373  
Financing Receivable, Allowance for Credit Losses 2,147       2,147   2,070  
Off-balance sheet [Member] | Crops [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 1,242,091       1,242,091   1,236,392  
Financing Receivable, Individually Evaluated for Impairment 11,497       11,497   8,904  
Financing Receivable, Gross 1,253,588       1,253,588   1,245,296  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 612       612   546  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 255       255   224  
Financing Receivable, Allowance for Credit Losses 867       867   770  
Off-balance sheet [Member] | Permanent Plantings [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 503,784       503,784   532,666  
Financing Receivable, Individually Evaluated for Impairment 2,374       2,374   2,239  
Financing Receivable, Gross 506,158       506,158   534,905  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 191       191   305  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 55       55   57  
Financing Receivable, Allowance for Credit Losses 246       246   362  
Off-balance sheet [Member] | Livestock [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 648,648       648,648   678,642  
Financing Receivable, Individually Evaluated for Impairment 3,308       3,308   2,782  
Financing Receivable, Gross 651,956       651,956   681,424  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 211       211   231  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 133       133   70  
Financing Receivable, Allowance for Credit Losses 344       344   301  
Off-balance sheet [Member] | Part-Time Farm [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 166,570       166,570   155,627  
Financing Receivable, Individually Evaluated for Impairment 896       896   806  
Financing Receivable, Gross 167,466       167,466   156,433  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 49       49   48  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 21       21   20  
Financing Receivable, Allowance for Credit Losses 70       70   68  
Off-balance sheet [Member] | Agriculture Storage and Processing [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 68,651       68,651   45,738  
Financing Receivable, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Gross 68,651       68,651   45,738  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 614       614   562  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0       0   0  
Financing Receivable, Allowance for Credit Losses 614       614   562  
Off-balance sheet [Member] | Other Commodity [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Collectively Evaluated for Impairment 3,509       3,509   4,981  
Financing Receivable, Individually Evaluated for Impairment 71       71   76  
Financing Receivable, Gross 3,580       3,580   5,057  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5       5   5  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1       1   2  
Financing Receivable, Allowance for Credit Losses 6       6   $ 7  
Allowance for Loan and Lease Losses [Member]                
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Financing Receivable, Allowance for Credit Losses, Write-downs $ (17)   $ 0   $ (17) $ (241)