3.19.3 html 726 587 1 true 100 0 false 7 false false R1.htm 0001000 - Document - Document and Entity Information Document Sheet http://www.bannerbank.com/role/DocumentAndEntityInformationDocument Document and Entity Information Document Cover 1 false false R2.htm 1001000 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfFinancialCondition CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Statements 2 false false R3.htm 1001001 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfFinancialConditionParenthetical CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 1004000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statements 6 false false R7.htm 1004001 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Statements 7 false false R8.htm 1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.bannerbank.com/role/ConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 2101100 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.bannerbank.com/role/BasisOfPresentationAndSignificantAccountingPolicies BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Notes 9 false false R10.htm 2102100 - Disclosure - ACCOUNTING STANDARDS RECENTLY ISSUED OR ADOPTED Sheet http://www.bannerbank.com/role/AccountingStandardsRecentlyIssuedOrAdopted ACCOUNTING STANDARDS RECENTLY ISSUED OR ADOPTED Notes 10 false false R11.htm 2103100 - Disclosure - BUSINESS COMBINATION Sheet http://www.bannerbank.com/role/BusinessCombination BUSINESS COMBINATION Notes 11 false false R12.htm 2104100 - Disclosure - SECURITIES Sheet http://www.bannerbank.com/role/Securities SECURITIES Notes 12 false false R13.htm 2105100 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLosses LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES Notes 13 false false R14.htm 2106100 - Disclosure - GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS Sheet http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRights GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS Notes 14 false false R15.htm 2106100 - Disclosure - REAL ESTATE OWNED, NET Sheet http://www.bannerbank.com/role/RealEstateOwnedNet REAL ESTATE OWNED, NET Notes 15 false false R16.htm 2108100 - Disclosure - DEPOSITS Sheet http://www.bannerbank.com/role/Deposits DEPOSITS Notes 16 false false R17.htm 2109100 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstruments FAIR VALUE OF FINANCIAL INSTRUMENTS Notes 17 false false R18.htm 2110100 - Disclosure - INCOME TAXES AND DEFERRED TAXES Sheet http://www.bannerbank.com/role/IncomeTaxesAndDeferredTaxes INCOME TAXES AND DEFERRED TAXES Notes 18 false false R19.htm 2111100 - Disclosure - CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (EPS) Sheet http://www.bannerbank.com/role/CalculationOfWeightedAverageSharesOutstandingForEarningsPerShareEps CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (EPS) Notes 19 false false R20.htm 2112100 - Disclosure - STOCK-BASED COMPENSATION PLANS Sheet http://www.bannerbank.com/role/StockBasedCompensationPlans STOCK-BASED COMPENSATION PLANS Notes 20 false false R21.htm 2113100 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.bannerbank.com/role/CommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 21 false false R22.htm 2114100 - Disclosure - DERIVATIVES AND HEDGING Sheet http://www.bannerbank.com/role/DerivativesAndHedging DERIVATIVES AND HEDGING Notes 22 false false R23.htm 2115100 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS Sheet http://www.bannerbank.com/role/RevenueFromContractsWithCustomers REVENUE FROM CONTRACTS WITH CUSTOMERS Notes 23 false false R24.htm 2116100 - Disclosure - LEASES Sheet http://www.bannerbank.com/role/Leases LEASES Notes 24 false false R25.htm 2201201 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.bannerbank.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPolicies BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 25 false false R26.htm 2304301 - Disclosure - SECURITIES (Tables) Sheet http://www.bannerbank.com/role/SecuritiesTables SECURITIES (Tables) Tables http://www.bannerbank.com/role/Securities 26 false false R27.htm 2305301 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Tables) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Tables) Tables http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLosses 27 false false R28.htm 2306301 - Disclosure - GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Tables) Sheet http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsTables GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Tables) Tables http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRights 28 false false R29.htm 2306301 - Disclosure - REAL ESTATE OWNED, NET (Tables) Sheet http://www.bannerbank.com/role/RealEstateOwnedNetTables REAL ESTATE OWNED, NET (Tables) Tables http://www.bannerbank.com/role/RealEstateOwnedNet 29 false false R30.htm 2308301 - Disclosure - DEPOSITS (Tables) Sheet http://www.bannerbank.com/role/DepositsTables DEPOSITS (Tables) Tables http://www.bannerbank.com/role/Deposits 30 false false R31.htm 2309301 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsTables FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) Tables http://www.bannerbank.com/role/FairValueOfFinancialInstruments 31 false false R32.htm 2310301 - Disclosure - INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Tables) Sheet http://www.bannerbank.com/role/IncomeTaxesAndDeferredTaxesIncomeTaxesAndDeferredTaxesTables INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Tables) Tables 32 false false R33.htm 2311301 - Disclosure - CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (EPS) (Tables) Sheet http://www.bannerbank.com/role/CalculationOfWeightedAverageSharesOutstandingForEarningsPerShareEpsTables CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (EPS) (Tables) Tables http://www.bannerbank.com/role/CalculationOfWeightedAverageSharesOutstandingForEarningsPerShareEps 33 false false R34.htm 2313301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.bannerbank.com/role/CommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.bannerbank.com/role/CommitmentsAndContingencies 34 false false R35.htm 2314301 - Disclosure - DERIVATIVES AND HEDGING (Tables) Sheet http://www.bannerbank.com/role/DerivativesAndHedgingTables DERIVATIVES AND HEDGING (Tables) Tables http://www.bannerbank.com/role/DerivativesAndHedging 35 false false R36.htm 2315301 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) Sheet http://www.bannerbank.com/role/RevenueFromContractsWithCustomersTables REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) Tables http://www.bannerbank.com/role/RevenueFromContractsWithCustomers 36 false false R37.htm 2316301 - Disclosure - LEASES (Tables) Sheet http://www.bannerbank.com/role/LeasesTables LEASES (Tables) Tables http://www.bannerbank.com/role/Leases 37 false false R38.htm 2402401 - Disclosure - ACCOUNTING STANDARDS RECENTLY ISSUED OR ADOPTED (Details) Sheet http://www.bannerbank.com/role/AccountingStandardsRecentlyIssuedOrAdoptedDetails ACCOUNTING STANDARDS RECENTLY ISSUED OR ADOPTED (Details) Details http://www.bannerbank.com/role/AccountingStandardsRecentlyIssuedOrAdopted 38 false false R39.htm 2403401 - Disclosure - BUSINESS COMBINATION (Details) Sheet http://www.bannerbank.com/role/BusinessCombinationDetails BUSINESS COMBINATION (Details) Details http://www.bannerbank.com/role/BusinessCombination 39 false false R40.htm 2403402 - Disclosure - BUSINESS COMBINATION - Purchase Price Allocation (Details) Sheet http://www.bannerbank.com/role/BusinessCombinationPurchasePriceAllocationDetails BUSINESS COMBINATION - Purchase Price Allocation (Details) Details 40 false false R41.htm 2404402 - Disclosure - SECURITIES (Schedule of Securities) (Details) Sheet http://www.bannerbank.com/role/SecuritiesScheduleOfSecuritiesDetails SECURITIES (Schedule of Securities) (Details) Details http://www.bannerbank.com/role/SecuritiesTables 41 false false R42.htm 2404403 - Disclosure - SECURITIES (Securities with Continuous Loss Position) (Details) Sheet http://www.bannerbank.com/role/SecuritiesSecuritiesWithContinuousLossPositionDetails SECURITIES (Securities with Continuous Loss Position) (Details) Details http://www.bannerbank.com/role/SecuritiesTables 42 false false R43.htm 2404404 - Disclosure - SECURITIES (Securities Debt Maturities) (Details) Sheet http://www.bannerbank.com/role/SecuritiesSecuritiesDebtMaturitiesDetails SECURITIES (Securities Debt Maturities) (Details) Details http://www.bannerbank.com/role/SecuritiesTables 43 false false R44.htm 2404405 - Disclosure - SECURITIES (Securities Pledged) (Details) Sheet http://www.bannerbank.com/role/SecuritiesSecuritiesPledgedDetails SECURITIES (Securities Pledged) (Details) Details http://www.bannerbank.com/role/SecuritiesTables 44 false false R45.htm 2404406 - Disclosure - SECURITIES (Textual) (Details) Sheet http://www.bannerbank.com/role/SecuritiesTextualDetails SECURITIES (Textual) (Details) Details http://www.bannerbank.com/role/SecuritiesTables 45 false false R46.htm 2405402 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesLoansByTypeDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 46 false false R47.htm 2405403 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Purchased Credit-Impaired Loans, Changes in Accretable Yield) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesPurchasedCreditImpairedLoansChangesInAccretableYieldDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Purchased Credit-Impaired Loans, Changes in Accretable Yield) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 47 false false R48.htm 2405404 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans With and Without Specific Reserves) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesImpairedLoansWithAndWithoutSpecificReservesDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans With and Without Specific Reserves) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 48 false false R49.htm 2405405 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Troubled Debt Restructuring) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTroubledDebtRestructuringDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Troubled Debt Restructuring) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 49 false false R50.htm 2405406 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Newly Restructured Loans) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesNewlyRestructuredLoansDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Newly Restructured Loans) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 50 false false R51.htm 2405407 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Troubled Debt Restructuring Which Incurred Payment Default) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesLoansReceivableAndAllowanceForLoanLossesTroubledDebtRestructuringWhichIncurredPaymentDefaultDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Troubled Debt Restructuring Which Incurred Payment Default) (Details) Details 51 false false R52.htm 2405408 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Risk-Rated and Non-Risk Rated Loans by Grade and Other Characteristic) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesRiskRatedAndNonRiskRatedLoansByGradeAndOtherCharacteristicDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Risk-Rated and Non-Risk Rated Loans by Grade and Other Characteristic) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 52 false false R53.htm 2405409 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Age Analysis of Company's Past Due Loans) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesAgeAnalysisOfCompanysPastDueLoansDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Age Analysis of Company's Past Due Loans) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 53 false false R54.htm 2405410 - Disclosure - LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Allowance for Loan Losses) (Details) Sheet http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesAllowanceForLoanLossesDetails LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Allowance for Loan Losses) (Details) Details http://www.bannerbank.com/role/LoansReceivableAndAllowanceForLoanLossesTables 54 false false R55.htm 2406402 - Disclosure - GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) Sheet http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsFiniteLivedIntangibleAssetsDetails GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) Details http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsTables 55 false false R56.htm 2406402 - Disclosure - REAL ESTATE OWNED, NET (REO Rollforward) (Details) Sheet http://www.bannerbank.com/role/RealEstateOwnedNetReoRollforwardDetails REAL ESTATE OWNED, NET (REO Rollforward) (Details) Details http://www.bannerbank.com/role/RealEstateOwnedNetTables 56 false false R57.htm 2406403 - Disclosure - GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) Sheet http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsEstimatedAnnualAmortizationExpenseDetails GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) Details http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsTables 57 false false R58.htm 2406403 - Disclosure - REAL ESTATE OWNED, NET REAL ESTATE OWNED, NET (Textual) (Details) Sheet http://www.bannerbank.com/role/RealEstateOwnedNetRealEstateOwnedNetTextualDetails REAL ESTATE OWNED, NET REAL ESTATE OWNED, NET (Textual) (Details) Details 58 false false R59.htm 2406404 - Disclosure - GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) Sheet http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsMortgageServicingRightsDetails GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) Details http://www.bannerbank.com/role/GoodwillOtherIntangibleAssetsAndMortgageServicingRightsTables 59 false false R60.htm 2408402 - Disclosure - DEPOSITS (Deposit Liabilities) (Details) Sheet http://www.bannerbank.com/role/DepositsDepositLiabilitiesDetails DEPOSITS (Deposit Liabilities) (Details) Details http://www.bannerbank.com/role/DepositsTables 60 false false R61.htm 2408403 - Disclosure - DEPOSITS DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) Sheet http://www.bannerbank.com/role/DepositsDepositsMaturitiesAndWeightedAverageInterestRatesOfCertificatesOfDepositDetails DEPOSITS DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) Details 61 false false R62.htm 2408404 - Disclosure - DEPOSITS DEPOSITS (Textual) (Details) Sheet http://www.bannerbank.com/role/DepositsDepositsTextualDetails DEPOSITS DEPOSITS (Textual) (Details) Details 62 false false R63.htm 2409402 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsFairValueByBalanceSheetLocationDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) Details http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsTables 63 false false R64.htm 2409403 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) Details http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsTables 64 false false R65.htm 2409404 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation Technique) (Details) Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsValuationTechniqueDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation Technique) (Details) Details http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsTables 65 false false R66.htm 2409405 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsUnobservableInputsReconciliationDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) Details http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsTables 66 false false R67.htm 2409406 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets Measured on Nonrecurring Basis) (Details) Sheet http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsAssetsMeasuredOnNonrecurringBasisDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets Measured on Nonrecurring Basis) (Details) Details http://www.bannerbank.com/role/FairValueOfFinancialInstrumentsTables 67 false false R68.htm 2410402 - Disclosure - INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Details) Sheet http://www.bannerbank.com/role/IncomeTaxesAndDeferredTaxesIncomeTaxesAndDeferredTaxesDetails INCOME TAXES AND DEFERRED TAXES INCOME TAXES AND DEFERRED TAXES (Details) Details http://www.bannerbank.com/role/IncomeTaxesAndDeferredTaxesIncomeTaxesAndDeferredTaxesTables 68 false false R69.htm 2411402 - Disclosure - CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (Details) Sheet http://www.bannerbank.com/role/CalculationOfWeightedAverageSharesOutstandingForEarningsPerShareDetails CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (Details) Details http://www.bannerbank.com/role/CalculationOfWeightedAverageSharesOutstandingForEarningsPerShareEpsTables 69 false false R70.htm 2412401 - Disclosure - STOCK-BASED COMPENSATION PLANS (Details) Sheet http://www.bannerbank.com/role/StockBasedCompensationPlansDetails STOCK-BASED COMPENSATION PLANS (Details) Details http://www.bannerbank.com/role/StockBasedCompensationPlans 70 false false R71.htm 2413402 - Disclosure - COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) Sheet http://www.bannerbank.com/role/CommitmentsAndContingenciesCommitmentsWithoutRecordedLiabilityDetails COMMITMENTS AND CONTINGENCIES (Commitments Without Recorded Liability) (Details) Details http://www.bannerbank.com/role/CommitmentsAndContingenciesTables 71 false false R72.htm 2414402 - Disclosure - DERIVATIVES AND HEDGING (Derivatives Designated as Hedging, by Balance Sheet Location) (Details) Sheet http://www.bannerbank.com/role/DerivativesAndHedgingDerivativesDesignatedAsHedgingByBalanceSheetLocationDetails DERIVATIVES AND HEDGING (Derivatives Designated as Hedging, by Balance Sheet Location) (Details) Details http://www.bannerbank.com/role/DerivativesAndHedgingTables 72 false false R73.htm 2414403 - Disclosure - DERIVATIVES AND HEDGING (Derivatives Not Designated as Hedging, by Balance Sheet Location) (Details) Sheet http://www.bannerbank.com/role/DerivativesAndHedgingDerivativesNotDesignatedAsHedgingByBalanceSheetLocationDetails DERIVATIVES AND HEDGING (Derivatives Not Designated as Hedging, by Balance Sheet Location) (Details) Details http://www.bannerbank.com/role/DerivativesAndHedgingTables 73 false false R74.htm 2414404 - Disclosure - DERIVATIVES AND HEDGING (Gain (Loss) On Derivatives Not Designated in Hedging Relationship) (Details) Sheet http://www.bannerbank.com/role/DerivativesAndHedgingGainLossOnDerivativesNotDesignatedInHedgingRelationshipDetails DERIVATIVES AND HEDGING (Gain (Loss) On Derivatives Not Designated in Hedging Relationship) (Details) Details http://www.bannerbank.com/role/DerivativesAndHedgingTables 74 false false R75.htm 2414405 - Disclosure - DERIVATIVES AND HEDGING (Narrative) (Details) Sheet http://www.bannerbank.com/role/DerivativesAndHedgingNarrativeDetails DERIVATIVES AND HEDGING (Narrative) (Details) Details http://www.bannerbank.com/role/DerivativesAndHedgingTables 75 false false R76.htm 2414406 - Disclosure - DERIVATIVES AND HEDGING (Derivative Offsetting) (Details) Sheet http://www.bannerbank.com/role/DerivativesAndHedgingDerivativeOffsettingDetails DERIVATIVES AND HEDGING (Derivative Offsetting) (Details) Details http://www.bannerbank.com/role/DerivativesAndHedgingTables 76 false false R77.htm 2415402 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) Sheet http://www.bannerbank.com/role/RevenueFromContractsWithCustomersDetails REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) Details http://www.bannerbank.com/role/RevenueFromContractsWithCustomersTables 77 false false R78.htm 2416402 - Disclosure - LEASES (Details) Sheet http://www.bannerbank.com/role/LeasesDetails LEASES (Details) Details http://www.bannerbank.com/role/LeasesTables 78 false false All Reports Book All Reports banr-9302019x10q.htm banr-20190930.xsd banr-20190930_cal.xml banr-20190930_def.xml banr-20190930_lab.xml banr-20190930_pre.xml banr-9302019xex311.htm banr-9302019xex312.htm banr-9302019xex32.htm http://fasb.org/us-gaap/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/srt/2019-01-31 true true