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Purchased Receivables - Summary Of Components Of Net Purchased Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Purchased Receivables [Abstract] |  |  |  |
Purchased receivables | $ 14,596 | $ 22,431 |  |
Reserve for purchased receivable losses | (190) | (200) | $ (171) | $ (181)
Total | $ 14,406 | $ 22,231 |  |

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- Definition Purchased Receivables + References No definition available. + Details
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Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Purchased Receivables [Abstract] + References No definition available. + Details
Name: | nrim_PurchasedReceivablesAbstract
Namespace Prefix: | nrim_
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Balance Type: | na
Period Type: | duration

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- Definition Purchased Receivables Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Reserve For Purchased Receivable Gains Losses + References No definition available. + Details
Name: | nrim_ReserveForPurchasedReceivableGainsLosses
Namespace Prefix: | nrim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant