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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 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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