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ADVANCES FROM FEDERAL HOME LOAN BANK OF DES MOINES (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Advances from Federal Home Loan Banks [Abstract]    
Federal Home Loan Bank, advances, collateral pledged $ 0 $ 0
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Maturing in one year or less 107,600,000 32,000,000
Maturing after one year through three years 25,000,000 0
Maturing after three years through five years 0 0
Maturing after five years 188,000 196,000
Total FHLB advances, at par 132,788,000 32,196,000
Fair value adjustment 593,000 54,000
Total FHLB advances, carried at fair value 133,381,000 32,250,000
Federal Home Loan Bank, advances, maximum outstanding at any month end 221,600,000 105,500,000
Federal Home Loan Bank, advances, average balance outstanding $ 45,000,000 $ 39,100,000
Federal Home Loan Bank, advances, average interest rate for year 0.69% 0.32%
Subsidiary, Banner Bank [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank, advances, percentage of total assets to support credit line 35.00%  
Federal Home Loan Bank, advances, maximum credit line $ 1,768,000,000  
Subsidiary, Islanders Bank [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank, advances, percentage of total assets to support credit line 35.00%  
Federal Home Loan Bank, advances, maximum credit line $ 28,000,000