XML 45 R36.htm IDEA: XBRL DOCUMENT
v3.23.3

SECURITIES (Textual) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) numberOfSecurities | Sep. 30, 2023 numberOfSecurities | Sep. 30, 2022 USD ($) numberOfSecurities | Dec. 31, 2022 numberOfSecurities
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Trading Securities, Number of Securities on Nonaccrual Status | 0 | 0 |  | 0
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 233 | 233 |  | 298
Available-for-sale Securities, Number of Securities in Nonaccrual Status | 0 | 0 |  | 0
Held-to-maturity Securities [Abstract] |  |  |  |
Trading Securities, Number of Securities Sold |  | 0 | 0 |
Debt Securities, Trading, Unrealized Gain | $ |  |  | $ 1,400,000 |
Debt Securities, Trading, Unrealized Loss | $ | $ (3,400,000) |  |  |

X
- Definition Available-for-sale Securities, Number of Securities in Nonaccrual Status + References No definition available. + Details
Name: | banr_AvailableforsaleSecuritiesNumberofSecuritiesinNonaccrualStatus
Namespace Prefix: | banr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Trading Securities, Number of Securities in Nonaccrual Status + References No definition available. + Details
Name: | banr_TradingSecuritiesNumberOfSecuritiesInNonaccrualStatus
Namespace Prefix: | banr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Trading Securities, Number of Securities Sold + References No definition available. + Details
Name: | banr_TradingSecuritiesNumberOfSecuritiesSold
Namespace Prefix: | banr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
Name: | us-gaap_DebtSecuritiesTradingUnrealizedGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
Name: | us-gaap_DebtSecuritiesTradingUnrealizedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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