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FAIR VALUE OF ASSETS AND LIABILITIES - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Capitalized mortgage servicing rights    
Moving average term of U.S. Treasury rate used to estimate the discount rate in order to determine the fair value of servicing rights (in years) 10 years  
Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Discount Rate Basis Spread on Variable Rate 5.00%  
Short-term FHLB advances    
Maturity period of short-term FHLB advances 90 days  
Securities available for sale $ 19,772,000 $ 19,028,000
Residential mortgage-backed securities    
Short-term FHLB advances    
Securities available for sale 17,387,000 16,558,000
State and municipal    
Short-term FHLB advances    
Securities available for sale 2,385,000 2,470,000
Total Assets at Fair Value    
Short-term FHLB advances    
Securities available for sale 19,772,000 19,028,000
Level 2    
Short-term FHLB advances    
Securities available for sale 19,772,000 19,028,000
Recurring basis    
Short-term FHLB advances    
Securities available for sale 19,772,000 19,028,000
Recurring basis | Residential mortgage-backed securities    
Short-term FHLB advances    
Securities available for sale 17,387,000 16,558,000
Recurring basis | State and municipal    
Short-term FHLB advances    
Securities available for sale 2,385,000 2,470,000
Recurring basis | Level 2    
Short-term FHLB advances    
Securities available for sale 19,772,000 19,028,000
Recurring basis | Level 2 | Residential mortgage-backed securities    
Short-term FHLB advances    
Securities available for sale 17,387,000 16,558,000
Recurring basis | Level 2 | State and municipal    
Short-term FHLB advances    
Securities available for sale 2,385,000 $ 2,470,000
Non-recurring basis    
Short-term FHLB advances    
Liabilities at fair value $ 0