FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 2,064,581	$ 2,104,511
Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	26,328	26,185
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,064,581	2,104,511
Total assets	2,120,213	2,160,839
Total liabilities	95,344	97,669
Recurring [Member] \| Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	73,366	67,477
Recurring [Member] \| Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	10,964	14,507
Derivative liabilities	21,468	30,184
Recurring [Member] \| Interest rate lock and forward sale commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	629	331
Derivative liabilities	497	2
Recurring [Member] \| Loan Participations and Assignments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	13	6
Recurring [Member] \| U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,232	7,933
Recurring [Member] \| Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	126,201	123,982
Recurring [Member] \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	110,947	124,990
Recurring [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,656,526	1,676,848
Recurring [Member] \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	163,675	170,758
Recurring [Member] \| Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	26,328	26,185
Recurring [Member] \| Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	511	481
Recurring [Member] \| SBA Servicing Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing asset	1,038	869
Recurring [Member] \| Investment in Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in limited partnerships	16,162	13,955
Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Total assets	511	481
Total liabilities	0	0
Recurring [Member] \| Level 1 [Member] \| Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	0	0
Recurring [Member] \| Level 1 [Member] \| Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] \| Level 1 [Member] \| Interest rate lock and forward sale commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] \| Level 1 [Member] \| Loan Participations and Assignments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Recurring [Member] \| Level 1 [Member] \| U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Level 1 [Member] \| Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Level 1 [Member] \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Level 1 [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Level 1 [Member] \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Level 1 [Member] \| Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Recurring [Member] \| Level 1 [Member] \| Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	511	481
Recurring [Member] \| Level 1 [Member] \| SBA Servicing Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing asset	0	0
Recurring [Member] \| Level 1 [Member] \| Investment in Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in limited partnerships	0	0
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,036,637	2,078,826
Total assets	2,073,929	2,119,739
Total liabilities	21,840	30,190
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	0	0
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	10,964	14,507
Derivative liabilities	21,468	30,184
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Interest rate lock and forward sale commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	221
Derivative liabilities	359	0
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Loan Participations and Assignments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	13	6
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,232	7,933
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	126,201	123,982
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	83,003	99,305
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,656,526	1,676,848
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	163,675	170,758
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	26,328	26,185
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| SBA Servicing Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing asset	0	0
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Investment in Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in limited partnerships	0	0
Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-For-Sale, Fair Value Disclosure, Unpaid Principal Balance	25,500	25,700
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	27,944	25,685
Total assets	45,773	40,619
Total liabilities	73,504	67,479
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	73,366	67,477
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Interest rate lock and forward sale commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	629
Derivative liabilities	138	2
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Loan Participations and Assignments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	27,944	25,685
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| SBA Servicing Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing asset	1,038	869
Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Investment in Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in limited partnerships	$ 16,162	$ 13,955

Investments in limited partnerships

No definition available.

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Balance Type:	debit
Period Type:	instant

- Definition

Loans Held-For-Sale, Fair Value Disclosure, Unpaid Principal Balance

+ References

No definition available.

+ Details

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

- Definition

SBA servicing asset

+ References

No definition available.

+ Details

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

- Definition

Fair value portion of asset recognized for present right to economic benefit.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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