XML 73 R58.htm IDEA: XBRL DOCUMENT
v3.25.0.1

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Textuals) (Details) | Dec. 31, 2024 banking_location office
--- | ---
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Number of offices | banking_location | 135
Subsidiary, Banner Bank [Member] |
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Number of production offices | office | 13
Minimum [Member] | Core Deposit Intangibles [Member] |
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Intangible asset, useful life | 8 years
Maximum [Member] | Core Deposit Intangibles [Member] |
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Intangible asset, useful life | 10 years

X
- Definition Number of Branch Offices in Which Entity Operates + References No definition available. + Details
Name: | banr_NumberOfBranchOfficesInWhichEntityOperates
Namespace Prefix: | banr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Loan Production Offices in Which Entity Operates + References No definition available. + Details
Name: | banr_NumberOfLoanProductionOfficesInWhichEntityOperates
Namespace Prefix: | banr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=banr_SubsidiaryBannerBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CoreDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |