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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Real Estate Partnerships (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
investment
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 $ 4,416 $ 4,909  
Investments accounted for under proportional amortization method 1,776 1,993  
Losses accounted for under the equity method 277 350 $ 384
Losses on investments accounted for under proportional amortization method 217 191 22,000
Federal tax credits $ 1,010 $ 736 $ 475