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Commitments and Contingencies - Off-Balance Sheet Commitments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitments to extend credit | $ 361,915 | $ 375,065
Commitments to originate loans held for sale | 81,617 | 150,276
Standby letters of credit | $ 2,364 | $ 2,333

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- Definition Standby Letters Of Credit Fair Value Disclosure + References No definition available. + Details
Name: | nrim_StandbyLettersOfCreditFairValueDisclosure
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unfunded Lending Commitment + References No definition available. + Details
Name: | nrim_UnfundedLendingCommitment
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommitmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant