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Loans - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, not past due | $ 8,315,566 |
Financing receivables, past due | 6,286 |
Nonaccrual loans | 114,998 | $ 87,781
Total Loans | 8,436,850 |
Nonaccrual loans with no associated allowance | 44,200 |
Interest received on nonaccrual loans | 4,400 |
Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, not past due | 6,055,154 |
Financing receivables, past due | 6,286 |
Nonaccrual loans | 114,998 |
Total Loans | 6,176,438 |
Rural Utilities: |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, not past due | 2,260,412 |
Financing receivables, past due | 0 |
Nonaccrual loans | 0 |
Total Loans | 2,260,412 |
30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 4,582 |
30-59 Days | Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 4,582 |
30-59 Days | Rural Utilities: |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 0 |
60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 632 |
60-89 Days | Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 632 |
60-89 Days | Rural Utilities: |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 0 |
90 Days and Greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 1,072 |
90 Days and Greater | Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 1,072 | $ 57,719
90 Days and Greater | Farm & Ranch | Payment Deferral, CARES Act |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 145,500 |
90 Days and Greater | Rural Utilities: |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | $ 0 |

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