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Loans - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | $ 7,758,286 | $ 7,758,286 | $ 7,261,933
Nonaccrual loans | 137,924 | 137,924 | 114,998
Total Loans | 9,020,921 | 9,020,921 | 8,436,850
Nonaccrual loans with no associated allowance | 44,800 | 44,800 | 44,200
Interest received on nonaccrual loans | 1,400 | 4,400 | 4,400
Farm & Ranch |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 6,777,749 | 6,777,749 | 6,176,438
Nonaccrual loans | 137,924 | 137,924 | 114,998
Total Loans | 6,777,749 | 6,777,749 | 6,176,438
Rural Utilities |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 2,243,172 | 2,243,172 | 2,260,412
Nonaccrual loans | 0 | 0 | 0
Total Loans | 2,243,172 | 2,243,172 | 2,260,412
Current |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 8,876,515 | 8,876,515 | 8,315,566
Current | Farm & Ranch |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 6,633,343 | 6,633,343 | 6,055,154
Current | Rural Utilities |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 2,243,172 | 2,243,172 | 2,260,412
Total Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 6,482 | 6,482 | 6,286
Total Past Due | Farm & Ranch |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 6,482 | 6,482 | 6,286
Total Past Due | Rural Utilities |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 0 | 0 | 0
30-59 Days |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 2,345 | 2,345 | 4,582
30-59 Days | Farm & Ranch |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 2,345 | 2,345 | 4,582
30-59 Days | Rural Utilities |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 0 | 0 | 0
60-89 Days |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 482 | 482 | 632
60-89 Days | Farm & Ranch |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 482 | 482 | 632
60-89 Days | Rural Utilities |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 0 | 0 | 0
90 Days and Greater |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 3,655 | 3,655 | 1,072
90 Days and Greater | Farm & Ranch |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 3,655 | 3,655 | 1,072
90 Days and Greater | Rural Utilities |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | $ 0 | $ 0 | $ 0

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