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Loans and Allowance for Losses and Concentrations of Credit Risk - Loan (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross $ 3,916,127   $ 3,873,755      
Allowance for Loan and Lease Losses, Real Estate 6,789   6,796      
Loans and Leases Receivable, Net Amount 5,352,584   5,266,786      
Financing Receivable, Allowance for Credit Losses 9,038 $ 8,456 8,866 $ 8,104 $ 7,638 $ 7,435
Real Estate Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 5,370,777   5,275,024      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (11,404)   (1,442)      
Loans and Leases Receivable, Gross 5,359,373   5,273,582      
Allowance for Loan and Lease Losses, Real Estate 6,789   6,796      
Loans and Leases Receivable, Net Amount 5,352,584   5,266,786      
Real Estate Loan [Member] | Farm & Ranch [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 4,378,958   4,198,733      
Real Estate Loan [Member] | Rural Utilities [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 991,819   1,076,291      
Unsecuritized [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 3,927,531   3,875,197      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (11,404)   (1,442)      
Loans and Leases Receivable, Gross 3,916,127   3,873,755      
Allowance for Loan and Lease Losses, Real Estate 5,339   5,493      
Loans and Leases Receivable, Net Amount 3,910,788   3,868,262      
Unsecuritized [Member] | Farm & Ranch [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 2,935,712   2,798,906      
Unsecuritized [Member] | Rural Utilities [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 991,819   1,076,291      
In Consolidated Trusts [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 1,443,246   1,399,827      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 0   0      
Loans and Leases Receivable, Gross 1,443,246   1,399,827      
Allowance for Loan and Lease Losses, Real Estate 1,450   1,303      
Loans and Leases Receivable, Net Amount 1,441,796   1,398,524      
In Consolidated Trusts [Member] | Farm & Ranch [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance 1,443,246   1,399,827      
In Consolidated Trusts [Member] | Rural Utilities [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Lease Receivable Unpaid Principal Balance $ 0   $ 0