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Allowance for Loan Losses - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |
Period of hardship forbearance of payments | 12 months
Period of hardship forbearance of payments for borrowers of substantial payments | 24 months
Percentage guaranteed as to principal and accrued interest by federal goverment in event of default | 97.00%

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- Definition Percentage guaranteed as to principal and accrued interest by federal goverment in event of default. + References No definition available. + Details
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Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of hardship forbearance of payments. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of hardship forbearance of payments for borrowers of substantial payments. + References No definition available. + Details
Name: | navi_PeriodOfHardshipForbearanceOfPaymentsForBorrowersOfSubstantialPayments
Namespace Prefix: | navi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC + Details
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Balance Type: | na
Period Type: | duration