FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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	10 years
Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Discount Rate Basis Spread on Variable Rate	5.00%	5.00%
Short-term FHLB advances
Maturity period of short-term FHLB advances	90 days
Securities available for sale	$ 18,881	$ 19,028
Residential mortgage-backed securities
Short-term FHLB advances
Securities available for sale	16,431	16,558
State and municipal
Short-term FHLB advances
Securities available for sale	2,450	2,470
Level 2
Short-term FHLB advances
Securities available for sale	18,881	19,028
Recurring basis | Total Assets at Fair Value
Short-term FHLB advances
Securities available for sale	18,881	19,028
Recurring basis | Total Assets at Fair Value | Residential mortgage-backed securities
Short-term FHLB advances
Securities available for sale	16,431	16,558
Recurring basis | Total Assets at Fair Value | State and municipal
Short-term FHLB advances
Securities available for sale	2,450	2,470
Recurring basis | Level 2
Short-term FHLB advances
Securities available for sale	18,881	19,028
Recurring basis | Level 2 | Residential mortgage-backed securities
Short-term FHLB advances
Securities available for sale	16,431	16,558
Recurring basis | Level 2 | State and municipal
Short-term FHLB advances
Securities available for sale	$ 2,450	$ 2,470