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OTHER BORROWINGS (Textuals) (Details)
Dec. 31, 2016
USD ($)
agreement
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Securities pledged to secure retail repurchase agreements $ 114,949,000    
Funds Borrowed Against Current Borrowing Capacity 105,685,000   $ 98,325,000
Repurchase Agreements [Member] | Retail repurchase agreements [Member]      
Debt Instrument [Line Items]      
Funds Borrowed Against Current Borrowing Capacity $ 105,685,000   98,325,000
Repurchase Agreements [Member] | Retail repurchase agreements [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Repurchase agreements, interest rate 0.15%    
Repurchase Agreements [Member] | Retail repurchase agreements [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Repurchase agreements, interest rate 0.40%    
Repurchase Agreements [Member] | Repurchase Agreement, Wholesale [Member]      
Debt Instrument [Line Items]      
Repurchase agreements, interest rate 2.15%    
Number of repurchase agreements | agreement 1    
Federal Reserve Bank Advances [Member] | Federal Reserve Bank of San Francisco [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 1,020,000,000    
Funds Borrowed Against Current Borrowing Capacity 0    
Subsidiary, Banner Bank [Member] | Federal Funds Purchased [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity 60,000,000    
Line of credit, current 0 $ 0  
Balance outstanding 0   $ 0
Subsidiary, Islanders Bank [Member] | Federal Funds Purchased [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity 5,000,000    
Line of credit, current $ 0 $ 0