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REGULATORY CAPITAL REQUIREMENTS (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Total capital to risk-weighted assets:    
Actual $ 2,024,046 $ 1,904,533
Actual, Ratio 0.1504 0.1458
Minimum for Capital Adequacy Purposes $ 1,076,652 $ 1,045,181
Minimum for Capital Adequacy Purposes, Ratio 0.0800 0.0800
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 1,345,814 $ 1,306,476
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions, Ratio 0.1000 0.1000
Tier 1 capital to risk-weighted assets:    
Actual $ 1,760,065 $ 1,650,872
Actual, Ratio 0.1308 0.1264
Minimum for Capital Adequacy Purposes $ 807,489 $ 783,886
Minimum for Capital Adequacy Purposes, Ratio 0.0600 0.0600
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 807,489 $ 783,886
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0600 0.0600
Tier 1 leverage capital to average assets:    
Actual $ 1,760,065 $ 1,650,872
Actual, Ratio 0.1105 0.1056
Minimum for Capital Adequacy Purposes $ 636,913 $ 625,387
Minimum for Capital Adequacy Purposes, Ratio 0.0400 0.0400
Tier 1 common equity to risk-weighted assets:    
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual $ 1,673,565 $ 1,564,372
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual 0.1244 0.1197
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum $ 605,616 $ 587,914
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.0450 0.0450
Banner Bank [Member]    
Total capital to risk-weighted assets:    
Actual $ 1,890,438 $ 1,789,371
Actual, Ratio 0.1403 0.1369
Minimum for Capital Adequacy Purposes $ 1,077,725 $ 1,045,273
Minimum for Capital Adequacy Purposes, Ratio 0.0800 0.0800
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 1,347,157 $ 1,306,592
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions, Ratio 0.1000 0.1000
Tier 1 capital to risk-weighted assets:    
Actual $ 1,726,457 $ 1,635,710
Actual, Ratio 0.1282 0.1252
Minimum for Capital Adequacy Purposes $ 808,294 $ 783,955
Minimum for Capital Adequacy Purposes, Ratio 0.0600 0.0600
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 1,077,725 $ 1,045,273
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0800 0.0800
Tier 1 leverage capital to average assets:    
Actual $ 1,726,457 $ 1,635,710
Actual, Ratio 0.1083 0.1046
Minimum for Capital Adequacy Purposes $ 637,392 $ 625,298
Minimum for Capital Adequacy Purposes, Ratio 0.0400 0.0400
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 796,740 $ 781,622
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0500 0.0500
Tier 1 common equity to risk-weighted assets:    
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual $ 1,726,457 $ 1,635,710
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual 0.1282 0.1252
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum $ 606,221 $ 587,966
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.0450 0.0450
Banking Regulation, Common Equity Tier One Risk-Based Capital, Well Capitalized, Minimum $ 875,652 $ 849,285
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum 0.0650 0.0650