XML 52 R42.htm IDEA: XBRL DOCUMENT
v3.23.3

Loans and Allowance for Credit Losses - Payment Performance Past Due (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | $ 2,044 | $ 5,100
30-59 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
60-89 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Greater Than 89 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 2,044 |
Commercial real estate | Owner occupied properties |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 271 |
Commercial real estate | 30-59 Days Past Due | Owner occupied properties |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Commercial real estate | 60-89 Days Past Due | Owner occupied properties |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Commercial real estate | Greater Than 89 Days Past Due | Owner occupied properties |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 271 |
Residential real estate | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 119 |
Residential real estate | 1-4 family residential construction loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 109 |
Residential real estate | 30-59 Days Past Due | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Residential real estate | 30-59 Days Past Due | 1-4 family residential construction loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Residential real estate | 60-89 Days Past Due | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Residential real estate | 60-89 Days Past Due | 1-4 family residential construction loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Residential real estate | Greater Than 89 Days Past Due | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 119 |
Residential real estate | Greater Than 89 Days Past Due | 1-4 family residential construction loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 109 |
Other construction, land development and raw land loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 1,545 |
Other construction, land development and raw land loans | 30-59 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Other construction, land development and raw land loans | 60-89 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | 0 |
Other construction, land development and raw land loans | Greater Than 89 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, modified | $ 1,545 |

X
- 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
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestModifiedAccumulated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=nrim_GreaterThan89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nrim_OwnerOccupiedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nrim_PropertiesSecuredByJuniorLiensAndRevolvingSecuredByFamilyFirstLiensMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=nrim_OtherConstructionLandDevelopmentAndRawLandLoansPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |