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STOCK REPURCHASES (Details) - Common Stock [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 22, 2021	Dec. 21, 2020	Mar. 27, 2019
Stock repurchases
Stock surrendered during period, shares		55,228	59,730	41,507
Banner Corp 2019 Share Repurchase Authorization [Member]
Stock repurchases
Stock Repurchase Program, Number of Shares Authorized to be Repurchased							1,757,637
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percent of Total Outstanding							5.00%
Stock Repurchased During Period, Shares	624,780
Stock Repurchased During Period, Average Price Per Share	$ 50.84
Banner Corp 2020 Share Repurchase Authorization
Stock repurchases
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						1,757,781
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percent of Total Outstanding						5.00%
Stock Repurchased During Period, Shares		1,050,000
Stock Repurchased During Period, Average Price Per Share		$ 53.84
Banner Corp 2021 Share Repurchase Authorization
Stock repurchases
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					1,712,510
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percent of Total Outstanding					5.00%
Stock Repurchased During Period, Shares		200,000
Stock Repurchased During Period, Average Price Per Share		$ 54.77
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		1,512,510

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