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REGULATORY CAPITAL REQUIREMENTS (Tables)
12 Months Ended
Dec. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of the Regulatory Capital Ratios and Minimum Regulatory Requirements
The following table shows the regulatory capital ratios of the Company and the Bank and the minimum regulatory requirements (dollars in thousands):
 ActualMinimum for Capital Adequacy PurposesMinimum to be Categorized as “Well Capitalized” Under Prompt Corrective Action Provisions
 AmountRatioAmountRatioAmountRatio
December 31, 2024:      
Banner Corporation—consolidated:      
Total capital to risk-weighted assets$2,024,046 15.04 %$1,076,652 8.00 %$1,345,814 10.00 %
Tier 1 capital to risk-weighted assets1,760,065 13.08 807,489 6.00 807,489 6.00 
Tier 1 capital to average leverage assets1,760,065 11.05 636,913 4.00 n/an/a
Tier 1 common equity to risk-weighted assets1,673,565 12.44 605,616 4.50 n/an/a
Banner Bank:      
Total capital to risk-weighted assets1,890,438 14.03 1,077,725 8.00 1,347,157 10.00 
Tier 1 capital to risk-weighted assets1,726,457 12.82 808,294 6.00 1,077,725 8.00 
Tier 1 capital to average leverage assets1,726,457 10.83 637,392 4.00 796,740 5.00 
Tier 1 common equity to risk-weighted assets1,726,457 12.82 606,221 4.50 875,652 6.50 
December 31, 2023:      
Banner Corporation—consolidated:      
Total capital to risk-weighted assets$1,904,533 14.58 %$1,045,181 8.00 %$1,306,476 10.00 %
Tier 1 capital to risk-weighted assets1,650,872 12.64 783,886 6.00 783,886 6.00 
Tier 1 capital to average leverage assets1,650,872 10.56 625,387 4.00 n/an/a
Tier 1 common equity to risk-weighted assets1,564,372 11.97 587,914 4.50 n/an/a
Banner Bank:     
Total capital to risk-weighted assets1,789,371 13.69 1,045,273 8.00 1,306,592 10.00 
Tier 1 capital to risk-weighted assets1,635,710 12.52 783,955 6.00 1,045,273 8.00 
Tier 1 capital to average leverage assets1,635,710 10.46 625,298 4.00 781,622 5.00 
Tier 1 common equity to risk-weighted assets1,635,710 12.52 587,966 4.50 849,285 6.50