XML 47 R37.htm IDEA: XBRL DOCUMENT v3.25.3

SECURITIES (Securities Pledged) (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Schedule of Pledged Financial Instruments, Not Separately Reported [Line Items]
Pledged Financial Instruments, Not Separately Reported, Carrying Value	$ 504,284
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	517,727
Pledged Financial Instruments, Not Separately Reported, Fair Value	435,369
Asset Pledged as Collateral without Right | Securities For State and Local Government Public Deposits
Schedule of Pledged Financial Instruments, Not Separately Reported [Line Items]
Pledged Financial Instruments, Not Separately Reported, Carrying Value	294,939
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	308,382
Pledged Financial Instruments, Not Separately Reported, Fair Value	263,059
Asset Pledged as Collateral without Right | Securities for Interest Rate Swap Counterparties
Schedule of Pledged Financial Instruments, Not Separately Reported [Line Items]
Pledged Financial Instruments, Not Separately Reported, Carrying Value	950
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	950
Pledged Financial Instruments, Not Separately Reported, Fair Value	807
Asset Pledged as Collateral without Right | Securities Sold under Agreements to Repurchase
Schedule of Pledged Financial Instruments, Not Separately Reported [Line Items]
Pledged Financial Instruments, Not Separately Reported, Carrying Value	205,928
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	205,928
Pledged Financial Instruments, Not Separately Reported, Fair Value	169,282
Asset Pledged as Collateral without Right | Interest Bearing Deposits for Other Debt Facilities
Schedule of Pledged Financial Instruments, Not Separately Reported [Line Items]
Pledged Financial Instruments, Not Separately Reported, Carrying Value	2,467
Securities pledged for Interest Rate Swap Counterparties, Amortized Cost	2,467
Pledged Financial Instruments, Not Separately Reported, Fair Value	$ 2,221

X

- Definition

Pledged Financial Instruments, Not Separately Reported, Amortized Cost

+ References

No definition available.

+ Details

Name:	banr_PledgedFinancialInstrumentsNotSeparatelyReportedAmortizedCost
Namespace Prefix:	banr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Pledged Financial Instruments, Not Separately Reported, Carrying Value

+ References

No definition available.

+ Details

Name:	banr_PledgedFinancialInstrumentsNotSeparatelyReportedCarryingValue
Namespace Prefix:	banr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Pledged Financial Instruments, Not Separately Reported, Fair Value

+ References

No definition available.

+ Details

Name:	banr_PledgedFinancialInstrumentsNotSeparatelyReportedFairValue
Namespace Prefix:	banr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Schedule of Pledged Financial Instruments, Not Separately Reported [Line Items]

+ References

No definition available.

+ Details

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

X

- Details

Name:	banr_DebtSecuritiesPledgedAxis=us-gaap_AssetPledgedAsCollateralWithoutRightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PledgingPurposeAxis=banr_SecuritiesForStateAndLocalGovernmentPublicDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PledgingPurposeAxis=banr_SecuritiesForInterestRateSwapCounterpartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PledgingPurposeAxis=us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PledgingPurposeAxis=banr_InterestBearingDepositsForOtherDebtFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: