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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans (Details) $ in Thousands | Jun. 30, 2022 USD ($)
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Receivables [Abstract] |
Existing Troubled Debt Restructurings, Accrual Status | $ 3,008
New Troubled Debt Restructurings, Nonaccrual Status | 5,844
Existing Troubled Debt Restructurings | $ 8,852

X
- Definition Financing Receivable, Troubled Debt Restructuring, Existing Restructuring + References No definition available. + Details
Name: | nrim_FinancingReceivableTroubledDebtRestructuringExistingRestructuring
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Troubled Debt Restructuring, Nonaccrual, Existing Restructuring + References No definition available. + Details
Name: | nrim_FinancingReceivableTroubledDebtRestructuringNonaccrualExistingRestructuring
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Troubled Debt Restructuring, Still Accruing, Existing Restructuring + References No definition available. + Details
Name: | nrim_FinancingReceivableTroubledDebtRestructuringStillAccruingExistingRestructuring
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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