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Interest Bearing Deposits in Other Banks (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2021 | Dec. 31, 2020
Interest Bearing Deposits In Other Banks [Abstract] |  |
Maximum maturity period | 1 year |
Interest bearing deposits at Federal Reserve Bank | $ 622,034 | $ 54,488
Interest bearing deposits at FHLB | 138 | 133
Other interest bearing deposits at other institutions | 2,850 | 38,040
Total | $ 625,022 | $ 92,661

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- Definition Interest bearing deposits at Federal Home Loan Bank (FHLB). + References No definition available. + Details
Name: | nrim_InterestBearingDepositsAtFederalHomeLoanBank
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest bearing deposits at Federal Reserve Bank (FRB). + References No definition available. + Details
Name: | nrim_InterestBearingDepositsAtFederalReserveBank
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest bearing deposits in other banks + References No definition available. + Details
Name: | nrim_InterestBearingDepositsInOtherBanksAbstract
Namespace Prefix: | nrim_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest bearing deposits in other banks, maximum maturity period. + References No definition available. + Details
Name: | nrim_InterestBearingDepositsInOtherBanksMaximumMaturityPeriod
Namespace Prefix: | nrim_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Other interest bearing deposits at other institutions. + References No definition available. + Details
Name: | nrim_OtherInterestBearingDepositsAtOtherInstitutions
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117340910&loc=d3e59706-112781 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_InterestBearingDepositsInBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant