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REGULATORY CAPITAL REQUIREMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021:      
The Company—consolidated:      
Total capital to risk-weighted assets$1,663,943 14.71 %$904,633 8.00 %$1,130,791 10.00 %
Tier 1 capital to risk-weighted assets1,440,694 12.74 678,474 6.00 678,474 6.00 
Tier 1 capital to average leverage assets1,440,694 8.76 658,091 4.00 n/an/a
Tier 1 common equity to risk-weighted assets1,305,194 11.54 508,856 4.50 n/an/a
Banner Bank:      
Total capital to risk- weighted assets1,552,204 13.73 904,159 8.00 1,130,199 10.00 
Tier 1 capital to risk- weighted assets1,428,955 12.64 678,119 6.00 904,159 8.00 
Tier 1 capital to average leverage assets1,428,955 8.69 657,882 4.00 822,353 5.00 
Tier 1 common equity to risk-weighted assets1,428,955 12.64 508,589 4.50 734,629 6.50 
December 31, 2020:      
The Company—consolidated:      
Total capital to risk-weighted assets$1,608,387 14.73 %$873,472 8.00 %$1,091,840 10.00 %
Tier 1 capital to risk-weighted assets1,371,736 12.56 655,104 6.00 655,104 6.00 
Tier 1 capital to average leverage assets1,371,736 9.50 577,331 4.00 n/an/a
Tier 1 common equity to risk-weighted assets1,228,236 11.25 491,328 4.50 n/an/a
Banner Bank:     
Total capital to risk- weighted assets1,438,012 13.39 859,260 8.00 1,074,075 10.00 
Tier 1 capital to risk- weighted assets1,303,590 12.14 644,445 6.00 859,260 8.00 
Tier 1 capital to average leverage assets1,303,590 9.22 565,620 4.00 707,025 5.00 
Tier 1 common equity to risk-weighted assets1,303,590 12.14 483,334 4.50 698,149 6.50 
Islanders Bank:     
Total capital to risk- weighted assets29,333 15.65 14,997 8.00 18,747 10.00 
Tier 1 capital to risk- weighted assets26,983 14.39 11,248 6.00 14,997 8.00 
Tier 1 capital to average leverage assets26,983 7.87 13,720 4.00 17,150 5.00 
Tier 1 common equity to risk-weighted assets26,983 14.39 8,436 4.50 12,185 6.50