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, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ 1,168 $ 33,297
Net unrealized gain on securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income 1,168 33,277
Net unrealized gain (loss) on derivatives designated as cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income $ 0 $ 20