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Purchased Receivables - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) customer purchased_receivable segment | Dec. 31, 2019 USD ($) purchased_receivable
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term of purchased receivables (less than) | 1 year |
Number of classes of purchased receivables | segment | 1 |
Number of restructured purchased receivables | $ 8,476,000 | $ 10,100,000
Nonperforming purchased receivables | $ 410,000 | $ 0
Number of customer relationships related to nonperforming purchased receivables | customer | 1 |
Purchased Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of purchased receivables past due | purchased_receivable | 0 | 0
Number of restructured purchased receivables | $ 0 | $ 0

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- Definition Financing Receivable, Past Due, Number + References No definition available. + Details
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Namespace Prefix: | nrim_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Customer Relationships Related To Nonperforming Purchased Receivables + References No definition available. + Details
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Namespace Prefix: | nrim_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Segments And Classes Of Purchased Receivables + References No definition available. + Details
Name: | nrim_NumberOfSegmentsAndClassesOfPurchasedReceivables
Namespace Prefix: | nrim_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Purchased Receivables, Nonperforming, Nonaccrual Of Interest + References No definition available. + Details
Name: | nrim_PurchasedReceivablesNonperformingNonaccrualOfInterest
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Purchased Receivables, Term of Receivable + References No definition available. + Details
Name: | nrim_PurchasedReceivablesTermofReceivable
Namespace Prefix: | nrim_
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 No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |