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Loans - Schedule of Composition of Loan Balances (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | $ 9,020,921 |  | $ 8,436,850 |  |  |
Total | 7,758,286 |  | 7,261,933 |  |  |
Allowance for losses | (14,294) |  | (13,832) |  |  |
Total loans, net of allowance | 9,022,915 |  | 8,535,146 |  |  |
Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 9,020,921 |  | 8,436,850 |  |  |
Unamortized premiums, discounts, fair value hedge basis adjustment, and other cost basis adjustments | 16,288 |  | 112,128 |  |  |
Total | 9,037,209 |  | 8,548,978 |  |  |
Allowance for losses | (14,294) |  | (13,832) |  |  |
Total loans, net of allowance | 9,022,915 |  | 8,535,146 |  |  |
Farm & Ranch |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 6,777,749 |  | 6,176,438 |  |  |
Total | 6,777,749 |  | 6,176,438 |  |  |
Allowance for losses | (3,506) | $ (3,092) | (3,745) | $ (5,739) | $ (6,039) | $ (10,454)
Farm & Ranch | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 6,777,749 |  | 6,176,438 |  |  |
Rural Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 2,243,172 |  | 2,260,412 |  |  |
Total | 2,243,172 |  | 2,260,412 |  |  |
Allowance for losses | (10,788) | $ (10,908) | (10,087) | $ (10,082) | $ (8,900) | $ 0
Rural Utilities | Real Estate Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 2,243,172 |  | 2,260,412 |  |  |
Unsecuritized |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 8,043,548 |  | 7,149,805 |  |  |
Unamortized premiums, discounts, fair value hedge basis adjustment, and other cost basis adjustments | 16,288 |  | 112,128 |  |  |
Total | 8,059,836 |  | 7,261,933 |  |  |
Allowance for losses | (13,621) |  | (12,943) |  |  |
Total loans, net of allowance | 8,046,215 |  | 7,248,990 |  |  |
Unsecuritized | Farm & Ranch |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 5,800,376 |  | 4,889,393 |  |  |
Unsecuritized | Rural Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 2,243,172 |  | 2,260,412 |  |  |
In Consolidated Trusts |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 977,373 |  | 1,287,045 |  |  |
Unamortized premiums, discounts, fair value hedge basis adjustment, and other cost basis adjustments | 0 |  | 0 |  |  |
Total | 977,373 |  | 1,287,045 |  |  |
Allowance for losses | (673) |  | (889) |  |  |
Total loans, net of allowance | 976,700 |  | 1,286,156 |  |  |
In Consolidated Trusts | Farm & Ranch |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | 977,373 |  | 1,287,045 |  |  |
In Consolidated Trusts | Rural Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unpaid principal balance | $ 0 |  | $ 0 |  |  |

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