XML 66 R56.htm IDEA: XBRL DOCUMENT v3.25.3

FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation Technique) (Details) - Fair Value, Inputs, Level 3 [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Junior Subordinated Debt [Member] | Weighted Average [Member] | Discounted cash flows [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Input, Discount Rate	7.74%	9.57%
Corporate Bonds (TPS securities) [Member] | Weighted Average [Member] | Discounted cash flows [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Input, Discount Rate	7.74%	9.57%
Financing Receivable | Maximum [Member] | Valuation, Market Approach
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Input, Discount to Appraised Value	50.00%	75.00%
Financing Receivable | Minimum [Member] | Valuation, Market Approach
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Input, Discount to Appraised Value	0.00%	0.00%
Interest Rate Lock Commitments [Member] | Weighted Average [Member] | Valuation, Pricing Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Input, Pull-Through Rate	90.11%	92.34%
SBA Servicing Rights | Weighted Average [Member] | Discounted cash flows [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Input, Constant Prepayment Rate	17.78%	18.85%

X

- Definition

Fair Value Input, Constant Prepayment Rate

+ References

No definition available.

+ Details

Name:	banr_FairValueInputConstantPrepaymentRate
Namespace Prefix:	banr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Input, Discount Rate

+ References

No definition available.

+ Details

Name:	banr_FairValueInputDiscountRate
Namespace Prefix:	banr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Input, Discount to Appraised Value

+ References

No definition available.

+ Details

Name:	banr_FairValueInputDiscountToAppraisedValue
Namespace Prefix:	banr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Input, Pull-Through Rate

+ References

No definition available.

+ Details

Name:	banr_FairValueInputPullThroughRate
Namespace Prefix:	banr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

[Line Items] for Fair Value Inputs, Assets and Liabilities, Quantitative Information [Table]

+ References

No definition available.

+ Details

Name:	banr_FairValueInputsAssetsAndLiabilitiesQuantitativeInformationLineItems
Namespace Prefix:	banr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=banr_TrustPreferredSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_FinanceReceivablesMember
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:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
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_FairValueByAssetClassAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=banr_ValuationPricingModelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=banr_SBAServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: