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Loans - Unpaid Principal Balances by Delinquency Status (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, not past due | $ 8,401,520 | $ 8,315,566
Financing receivables, past due | 19,144 | 6,286
Nonaccrual loans | 129,407 | 114,998
Total Loans | 8,550,071 | 8,436,850
Nonaccrual loans with no associated allowance | 58,100 | 44,200
Interest received on nonaccrual loans | 1,100 | 4,400
Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, not past due | 6,154,416 | 6,055,154
Financing receivables, past due | 19,144 | 6,286
Nonaccrual loans | 129,407 | 114,998
Total Loans | 6,302,967 | 6,176,438
Rural Utilities |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, not past due | 2,247,104 | 2,260,412
Financing receivables, past due | 0 | 0
Nonaccrual loans | 0 | 0
Total Loans | 2,247,104 | 2,260,412
30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 4,733 | 4,582
30-59 Days | Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 4,733 | 4,582
30-59 Days | Rural Utilities |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 0 | 0
60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 261 | 632
60-89 Days | Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 261 | 632
60-89 Days | Rural Utilities |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 0 | 0
90 Days and Greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 14,150 | 1,072
90 Days and Greater | Farm & Ranch |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | 14,150 | 1,072
90 Days and Greater | Rural Utilities |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivables, past due | $ 0 | $ 0

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