XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Allowance for Loan Losses - Recorded Investment Segregated By Amounts Individually Or Collectively In Allowance For Loan Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | $ 971,683 | $ 959,109
Balance, end of period: Individually evaluated for impairment | 33,239 | 31,967
Balance, end of period: Collectively evaluated for impairment | 938,444 | 927,142
Commercial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 316,081 | 313,514
Balance, end of period: Individually evaluated for impairment | 26,631 | 26,812
Balance, end of period: Collectively evaluated for impairment | 289,450 | 286,702
Real estate construction one-to-four family |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 30,310 | 31,201
Balance, end of period: Individually evaluated for impairment | 0 | 0
Balance, end of period: Collectively evaluated for impairment | 30,310 | 31,201
Real estate construction other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 54,947 | 80,093
Balance, end of period: Individually evaluated for impairment | 0 | 0
Balance, end of period: Collectively evaluated for impairment | 54,947 | 80,093
Real estate term owner occupied |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 132,589 | 132,042
Balance, end of period: Individually evaluated for impairment | 4,584 | 2,862
Balance, end of period: Collectively evaluated for impairment | 128,005 | 129,180
Real estate term non-owner occupied |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 339,621 | 319,313
Balance, end of period: Individually evaluated for impairment | 861 | 874
Balance, end of period: Collectively evaluated for impairment | 338,760 | 318,439
Real estate term other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 56,294 | 40,411
Balance, end of period: Individually evaluated for impairment | 541 | 559
Balance, end of period: Collectively evaluated for impairment | 55,753 | 39,852
Consumer secured by 1st deeds of trust |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 21,896 | 22,616
Balance, end of period: Individually evaluated for impairment | 622 | 860
Balance, end of period: Collectively evaluated for impairment | 21,274 | 21,756
Consumer other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total financing receivables | 19,945 | 19,919
Balance, end of period: Individually evaluated for impairment | 0 | 0
Balance, end of period: Collectively evaluated for impairment | $ 19,945 | $ 19,919

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

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

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