Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Equity $ 134,667 $ 171,051 $ 218,067 $ 210,122
Net unrealized gain on securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Equity 1,878 1,370    
Accumulated other comprehensive income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Equity $ 1,878 $ 1,370 $ 1,168 $ 33,297