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STOCK-BASED COMPENSATION PLANS AND STOCK OPTIONS (Details)
3 Months Ended 9 Months Ended 17 Months Ended 38 Months Ended
Apr. 24, 2012
increment
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Jun. 30, 2015
shares
Dec. 31, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Deferred compensation | $   $ 20,910,000   $ 20,910,000   $ 20,910,000   $ 16,807,000
Unearned Restricted ESOP Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Expense | $   831,000 $ 710,000 2,500,000 $ 1,800,000      
Compensation Cost Not yet Recognized | $   $ 5,300,000   $ 5,300,000   $ 5,300,000    
Compensation Cost Not yet Recognized, Period for Recognition       30 months        
Stock Option Plans [Member] | Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Shares Authorized   68,571   68,571   68,571    
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price Percentage of Fair Value of Stock       100.00%        
Award Expiration Period       10 years        
Annual Vesting Percentage       20.00%        
Options, Grants in Period       0        
Options, Exercises in Period   0 0 0 0      
Share-based Compensation Expense | $   $ 0 $ 0 $ 0 $ 0      
Banner Corporation Long-Term Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Expense | $       $ (103,000) $ (122,000)      
2012 Restricted Stock Plan [Member] | Unearned Restricted ESOP Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Shares Authorized   300,000   300,000   300,000    
Award Vesting Period       3 years        
Number of Increments Shares Vest Annually | increment 3              
Restricted stock granted             299,830  
Restricted stock grants, shares vested             149,085  
Restricted stock grants, shares non-vested   150,745   150,745   150,745    
2014 Omnibus Incentive Plan [Member] | Unearned Restricted ESOP Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Shares Authorized   900,000   900,000   900,000    
Restricted stock granted           65,103    
Restricted stock grants, shares vested           9,352    
2014 Omnibus Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock granted           7,331