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FAIR VALUE - Cumulative other-than-temporary credit losses (Details 4) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Estimated credit losses, beginning of year $ 3,262
Sales of securities with previous OTTI recognized $ (3,262)
Credit losses - no previous OTTI recognized
Credit losses - previous OTTI recognized
Estimated credit losses, end of period