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Loans and Accrued Interest Receivable and Allowance for Loan Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 26, 2022
Mar. 31, 2022
Consumer loans - Non-Nelnet Bank:    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Sale of financing receivable $ 18,100  
Loans sold, gain $ 3,000  
Residual interest received on sale of financing receivable 6.60%  
Consumer Portfolio Segment, Private Education Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Liability related to unfunded private education loan commitments   $ 36
Unfunded private education loan commitments   37,900
Provision for loan losses   $ 24