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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment $ 6,720,503 $ 6,031,565    
Financing Receivable, Individually Evaluated for Impairment 147,083 107,739    
Financing Receivable, Gross 6,867,586 6,139,304    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5,982 5,143    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,884 2,292    
Financing Receivable, Allowance for Credit Losses 8,866 7,435 $ 6,563 $ 10,127
Total provision for losses 1,758 1,002 208  
Financing Receivable, Allowance for Credit Losses, Write-downs (327) (130) (3,772)  
Crops [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 3,581,213 3,357,301    
Financing Receivable, Individually Evaluated for Impairment 76,732 53,197    
Financing Receivable, Gross 3,657,945 3,410,498    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,650 2,420    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,431 945    
Financing Receivable, Allowance for Credit Losses 4,081 3,365 2,791 2,519
Total provision for losses 944 574 272  
Financing Receivable, Allowance for Credit Losses, Write-downs (228) 0 0  
Permanent Plantings [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 1,327,144 1,006,935    
Financing Receivable, Individually Evaluated for Impairment 40,419 30,505    
Financing Receivable, Gross 1,367,563 1,037,440    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,406 933    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,063 790    
Financing Receivable, Allowance for Credit Losses 2,469 1,723 931 2,159
Total provision for losses 816 792 (1,228)  
Financing Receivable, Allowance for Credit Losses, Write-downs (70) 0 0  
Livestock [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 1,314,410 1,290,332    
Financing Receivable, Individually Evaluated for Impairment 20,548 15,512    
Financing Receivable, Gross 1,334,958 1,305,844    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 969 976    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 242 399    
Financing Receivable, Allowance for Credit Losses 1,211 1,375 1,781 1,423
Total provision for losses (151) (406) 358  
Financing Receivable, Allowance for Credit Losses, Write-downs (13) 0 0  
Part-Time Farm [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 424,964 315,549    
Financing Receivable, Individually Evaluated for Impairment 8,664 8,525    
Financing Receivable, Gross 433,628 324,074    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 335 247    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 146 158    
Financing Receivable, Allowance for Credit Losses 481 405 408 467
Total provision for losses 92 127 52  
Financing Receivable, Allowance for Credit Losses, Write-downs (16) (130) (111)  
Agriculture Storage and Processing [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 58,761 48,051    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Gross 58,761 48,051    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 606 533    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 606 533 649 3,552
Total provision for losses 73 (116) 758  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 0 (3,661)  
Other Commodity [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 14,011 13,397    
Financing Receivable, Individually Evaluated for Impairment 720 0    
Financing Receivable, Gross 14,731 13,397    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 16 34    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2 0    
Financing Receivable, Allowance for Credit Losses 18 34 3 $ 7
Total provision for losses (16) 31 (4)  
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 4,066,457 3,426,768    
Financing Receivable, Individually Evaluated for Impairment 132,276 87,686    
Financing Receivable, Gross 4,198,733 3,514,454    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4,285 3,630    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,511 1,785    
Financing Receivable, Allowance for Credit Losses 6,796 5,415    
On-balance sheet [Member] | Crops [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 2,344,821 2,115,450    
Financing Receivable, Individually Evaluated for Impairment 67,828 41,648    
Financing Receivable, Gross 2,412,649 2,157,098    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,104 2,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,207 613    
Financing Receivable, Allowance for Credit Losses 3,311 2,613    
On-balance sheet [Member] | Permanent Plantings [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 794,478 569,360    
Financing Receivable, Individually Evaluated for Impairment 38,180 27,770    
Financing Receivable, Gross 832,658 597,130    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,101 652    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,006 770    
Financing Receivable, Allowance for Credit Losses 2,107 1,422    
On-balance sheet [Member] | Livestock [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 635,768 537,859    
Financing Receivable, Individually Evaluated for Impairment 17,766 10,658    
Financing Receivable, Gross 653,534 548,517    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 738 735    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 172 270    
Financing Receivable, Allowance for Credit Losses 910 1,005    
On-balance sheet [Member] | Part-Time Farm [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 269,337 183,660    
Financing Receivable, Individually Evaluated for Impairment 7,858 7,610    
Financing Receivable, Gross 277,195 191,270    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 287 193    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 126 132    
Financing Receivable, Allowance for Credit Losses 413 325    
On-balance sheet [Member] | Agriculture Storage and Processing [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 13,023 11,545    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Gross 13,023 11,545    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 44 22    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 44 22    
On-balance sheet [Member] | Other Commodity [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 9,030 8,894    
Financing Receivable, Individually Evaluated for Impairment 644 0    
Financing Receivable, Gross 9,674 8,894    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 11 28    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 11 28    
Off-balance sheet [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 2,654,046 2,604,797    
Financing Receivable, Individually Evaluated for Impairment 14,807 20,053    
Financing Receivable, Gross 2,668,853 2,624,850    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,697 1,513    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 373 507    
Financing Receivable, Allowance for Credit Losses 2,070 2,020    
Off-balance sheet [Member] | Crops [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 1,236,392 1,241,851    
Financing Receivable, Individually Evaluated for Impairment 8,904 11,549    
Financing Receivable, Gross 1,245,296 1,253,400    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 546 420    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 224 332    
Financing Receivable, Allowance for Credit Losses 770 752    
Off-balance sheet [Member] | Permanent Plantings [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 532,666 437,575    
Financing Receivable, Individually Evaluated for Impairment 2,239 2,735    
Financing Receivable, Gross 534,905 440,310    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 305 281    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 57 20    
Financing Receivable, Allowance for Credit Losses 362 301    
Off-balance sheet [Member] | Livestock [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 678,642 752,473    
Financing Receivable, Individually Evaluated for Impairment 2,782 4,854    
Financing Receivable, Gross 681,424 757,327    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 231 241    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 70 129    
Financing Receivable, Allowance for Credit Losses 301 370    
Off-balance sheet [Member] | Part-Time Farm [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 155,627 131,889    
Financing Receivable, Individually Evaluated for Impairment 806 915    
Financing Receivable, Gross 156,433 132,804    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 48 54    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 20 26    
Financing Receivable, Allowance for Credit Losses 68 80    
Off-balance sheet [Member] | Agriculture Storage and Processing [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 45,738 36,506    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Gross 45,738 36,506    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 562 511    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 562 511    
Off-balance sheet [Member] | Other Commodity [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Collectively Evaluated for Impairment 4,981 4,503    
Financing Receivable, Individually Evaluated for Impairment 76 0    
Financing Receivable, Gross 5,057 4,503    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5 6    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2 0    
Financing Receivable, Allowance for Credit Losses 7 6    
Allowance for Loan and Lease Losses [Member]        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Financing Receivable, Allowance for Credit Losses, Write-downs $ (327) $ (130) $ (3,772)