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REGULATORY CAPITAL REQUIREMENTS (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Total capital to risk-weighted assets:    
Actual $ 1,769,064 $ 1,663,943
Actual, Ratio 0.1404 0.1471
Minimum for Capital Adequacy Purposes $ 1,008,232 $ 904,633
Minimum for Capital Adequacy Purposes, Ratio 0.0800 0.0800
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 1,260,290 $ 1,130,791
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 $ 1,528,694 $ 1,440,694
Actual, Ratio 0.1213 0.1274
Minimum for Capital Adequacy Purposes $ 756,174 $ 678,474
Minimum for Capital Adequacy Purposes, Ratio 0.0600 0.0600
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 756,174 $ 678,474
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 $ 1,528,694 $ 1,440,694
Actual, Ratio 0.0945 0.0876
Minimum for Capital Adequacy Purposes $ 647,345 $ 658,091
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 $ 1,442,194 $ 1,305,194
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual 0.1144 0.1154
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum $ 567,130 $ 508,856
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 $ 1,684,766 $ 1,552,204
Actual, Ratio 0.1338 0.1373
Minimum for Capital Adequacy Purposes $ 1,007,325 $ 904,159
Minimum for Capital Adequacy Purposes, Ratio 0.0800 0.0800
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 1,259,156 $ 1,130,199
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 $ 1,544,396 $ 1,428,955
Actual, Ratio 0.1227 0.1264
Minimum for Capital Adequacy Purposes $ 755,494 $ 678,119
Minimum for Capital Adequacy Purposes, Ratio 0.0600 0.0600
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 1,007,325 $ 904,159
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 $ 1,544,396 $ 1,428,955
Actual, Ratio 0.0955 0.0869
Minimum for Capital Adequacy Purposes $ 646,935 $ 657,882
Minimum for Capital Adequacy Purposes, Ratio 0.0400 0.0400
Minimum to be Categorized as Well-Capitalized Under Prompt Corrective Action Provisions $ 808,668 $ 822,353
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 $ 1,544,396 $ 1,428,955
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual 0.1227 0.1264
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum $ 566,620 $ 508,589
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 $ 818,452 $ 734,629
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum 0.0650 0.0650