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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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment $ 7,079,331 $ 6,720,503    
Financing Receivable, Individually Evaluated for Impairment 154,640 147,083    
Financing Receivable, Gross 7,233,971 6,867,586    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5,779 5,982    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 3,405 2,884    
Financing Receivable, Allowance for Credit Losses 9,184 8,866 $ 7,435 $ 6,563
Total provision for losses 335 1,758 1,002  
Financing Receivable, Allowance for Credit Losses, Write-downs (17) (327) (130)  
Crops [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 3,691,897 3,581,213    
Financing Receivable, Individually Evaluated for Impairment 79,730 76,732    
Financing Receivable, Gross 3,771,627 3,657,945    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,788 2,650    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,606 1,431    
Financing Receivable, Allowance for Credit Losses 4,394 4,081 3,365 2,791
Total provision for losses 313 944 574  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 228 0  
Permanent Plantings [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 1,468,239 1,327,144    
Financing Receivable, Individually Evaluated for Impairment 41,582 40,419    
Financing Receivable, Gross 1,509,821 1,367,563    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 992 1,406    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,134 1,063    
Financing Receivable, Allowance for Credit Losses 2,126 2,469 1,723 931
Total provision for losses (343) 816 792  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 70 0  
Livestock [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 1,330,274 1,314,410    
Financing Receivable, Individually Evaluated for Impairment 25,098 20,548    
Financing Receivable, Gross 1,355,372 1,334,958    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 938 969    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 522 242    
Financing Receivable, Allowance for Credit Losses 1,460 1,211 1,375 1,781
Total provision for losses 249 (151) (406)  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 13 0  
Part-Time Farm [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 495,977 424,964    
Financing Receivable, Individually Evaluated for Impairment 8,161 8,664    
Financing Receivable, Gross 504,138 433,628    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 332 335    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 142 146    
Financing Receivable, Allowance for Credit Losses 474 481 405 408
Total provision for losses 10 92 127  
Financing Receivable, Allowance for Credit Losses, Write-downs 17 16 (130)  
Agriculture Storage and Processing [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 85,181 58,761    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Gross 85,181 58,761    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 720 606    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 720 606 533 649
Total provision for losses 114 73 (116)  
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 7,763 14,011    
Financing Receivable, Individually Evaluated for Impairment 69 720    
Financing Receivable, Gross 7,832 14,731    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 9 16    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1 2    
Financing Receivable, Allowance for Credit Losses 10 18 34 $ 3
Total provision for losses (8) (16) 31  
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 4,456,918 4,066,457    
Financing Receivable, Individually Evaluated for Impairment 131,404 132,276    
Financing Receivable, Gross 4,588,322 4,198,733    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4,064 4,285    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,953 2,511    
Financing Receivable, Allowance for Credit Losses 7,017 6,796    
On-balance sheet [Member] | Crops [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 2,452,803 2,344,821    
Financing Receivable, Individually Evaluated for Impairment 66,432 67,828    
Financing Receivable, Gross 2,519,235 2,412,649    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,120 2,104    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,329 1,207    
Financing Receivable, Allowance for Credit Losses 3,449 3,311    
On-balance sheet [Member] | Permanent Plantings [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 952,719 794,478    
Financing Receivable, Individually Evaluated for Impairment 36,333 38,180    
Financing Receivable, Gross 989,052 832,658    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 822 1,101    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,065 1,006    
Financing Receivable, Allowance for Credit Losses 1,887 2,107    
On-balance sheet [Member] | Livestock [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 705,752 635,768    
Financing Receivable, Individually Evaluated for Impairment 21,361 17,766    
Financing Receivable, Gross 727,113 653,534    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 731 738    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 437 172    
Financing Receivable, Allowance for Credit Losses 1,168 910    
On-balance sheet [Member] | Part-Time Farm [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 329,070 269,337    
Financing Receivable, Individually Evaluated for Impairment 7,278 7,858    
Financing Receivable, Gross 336,348 277,195    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 303 287    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 122 126    
Financing Receivable, Allowance for Credit Losses 425 413    
On-balance sheet [Member] | Agriculture Storage and Processing [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 12,097 13,023    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Gross 12,097 13,023    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 84 44    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 84 44    
On-balance sheet [Member] | Other Commodity [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 4,477 9,030    
Financing Receivable, Individually Evaluated for Impairment 0 644    
Financing Receivable, Gross 4,477 9,674    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4 11    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 4 11    
Off-balance sheet [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 2,622,413 2,654,046    
Financing Receivable, Individually Evaluated for Impairment 23,236 14,807    
Financing Receivable, Gross 2,645,649 2,668,853    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,715 1,697    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 452 373    
Financing Receivable, Allowance for Credit Losses 2,167 2,070    
Off-balance sheet [Member] | Crops [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 1,239,094 1,236,392    
Financing Receivable, Individually Evaluated for Impairment 13,298 8,904    
Financing Receivable, Gross 1,252,392 1,245,296    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 668 546    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 277 224    
Financing Receivable, Allowance for Credit Losses 945 770    
Off-balance sheet [Member] | Permanent Plantings [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 515,520 532,666    
Financing Receivable, Individually Evaluated for Impairment 5,249 2,239    
Financing Receivable, Gross 520,769 534,905    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 170 305    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 69 57    
Financing Receivable, Allowance for Credit Losses 239 362    
Off-balance sheet [Member] | Livestock [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 624,522 678,642    
Financing Receivable, Individually Evaluated for Impairment 3,737 2,782    
Financing Receivable, Gross 628,259 681,424    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 207 231    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 85 70    
Financing Receivable, Allowance for Credit Losses 292 301    
Off-balance sheet [Member] | Part-Time Farm [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 166,907 155,627    
Financing Receivable, Individually Evaluated for Impairment 883 806    
Financing Receivable, Gross 167,790 156,433    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 29 48    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 20 20    
Financing Receivable, Allowance for Credit Losses 49 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 73,084 45,738    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Gross 73,084 45,738    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 636 562    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 636 562    
Off-balance sheet [Member] | Other Commodity [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 3,286 4,981    
Financing Receivable, Individually Evaluated for Impairment 69 76    
Financing Receivable, Gross 3,355 5,057    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5 5    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1 2    
Financing Receivable, Allowance for Credit Losses 6 7    
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Allowance for Credit Losses, Write-downs $ (17) $ (327) $ (130)