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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Real Estate Partnerships (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
investment
Dec. 31, 2014
USD ($)
Accounting Policies [Abstract]      
Limited partner interest (as a percent) 99.00%    
Number of investments accounted for under the proportional amortization method | investment   1  
Recorded investment in real estate partnerships $ 4,909 $ 5,450  
Investments accounted for under proportional amortization method 1,993 2,205  
Losses accounted for under the equity method 350 384 $ 150
Losses on investments accounted for under proportional amortization method 191    
Federal tax credits $ 736 $ 475 $ 475