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Loans and Allowance for Losses and Concentrations of Credit Risk - Loan (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 4,004,968 | $ 3,873,755 |  |
Allowance for Loan and Lease Losses, Real Estate | 7,017 | 6,796 |  |
Loans and Leases Receivable, Net Amount | 5,515,052 | 5,266,786 |  |
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 |
Real Estate Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | 5,527,166 | 5,275,024 |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (5,097) | (1,442) |  |
Loans and Leases Receivable, Gross | 5,522,069 | 5,273,582 |  |
Allowance for Loan and Lease Losses, Real Estate | 7,017 | 6,796 |  |
Loans and Leases Receivable, Net Amount | 5,515,052 | 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 | 4,588,323 | 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 | 938,843 | 1,076,291 |  |
Unsecuritized [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | 4,010,065 | 3,875,197 |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (5,097) | (1,442) |  |
Loans and Leases Receivable, Gross | 4,004,968 | 3,873,755 |  |
Allowance for Loan and Lease Losses, Real Estate | 5,565 | 5,493 |  |
Loans and Leases Receivable, Net Amount | 3,999,403 | 3,868,262 |  |
Unsecuritized [Member] | Farm & Ranch [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | 3,071,222 | 2,798,906 |  |
Unsecuritized [Member] | Rural Utilities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | 938,843 | 1,076,291 |  |
In Consolidated Trusts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Lease Receivable Unpaid Principal Balance | 1,517,101 | 1,399,827 |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | 0 | 0 |  |
Loans and Leases Receivable, Gross | 1,517,101 | 1,399,827 |  |
Allowance for Loan and Lease Losses, Real Estate | 1,452 | 1,303 |  |
Loans and Leases Receivable, Net Amount | 1,515,649 | 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 | 1,517,101 | 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 |  |
Crops [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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