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Loans and Allowance for Losses and Concentrations of Credit Risk - Loan (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 3,873,755 $ 3,379,884    
Allowance for Loan and Lease Losses, Real Estate 6,796 5,415    
Loans and Leases Receivable, Net Amount 5,266,786 4,507,435    
Financing Receivable, Allowance for Credit Losses 8,866 7,435 $ 6,563 $ 10,127
Real Estate Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 5,275,024 4,513,966    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (1,442) (1,116)    
Loans and Leases Receivable, Gross 5,273,582 4,512,850    
Allowance for Loan and Lease Losses, Real Estate 6,796 5,415    
Loans and Leases Receivable, Net Amount 5,266,786 4,507,435    
Real Estate Loan [Member] | Farm & Ranch [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 4,198,733 3,514,454    
Real Estate Loan [Member] | Rural Utilities [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 1,076,291 999,512    
Unsecuritized [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 3,875,197 3,381,000    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (1,442) (1,116)    
Loans and Leases Receivable, Gross 3,873,755 3,379,884    
Allowance for Loan and Lease Losses, Real Estate 5,493 4,437    
Loans and Leases Receivable, Net Amount 3,868,262 3,375,447    
Unsecuritized [Member] | Farm & Ranch [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 2,798,906 2,381,488    
Unsecuritized [Member] | Rural Utilities [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 1,076,291 999,512    
In Consolidated Trusts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 1,399,827 1,132,966    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 0 0    
Loans and Leases Receivable, Gross 1,399,827 1,132,966    
Allowance for Loan and Lease Losses, Real Estate 1,303 978    
Loans and Leases Receivable, Net Amount 1,398,524 1,131,988    
In Consolidated Trusts [Member] | Farm & Ranch [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance 1,399,827 1,132,966    
In Consolidated Trusts [Member] | Rural Utilities [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Lease Receivable Unpaid Principal Balance $ 0 $ 0