Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES AVAILABLE-FOR-SALE AND OTHER SECURITIES - Security Impairment (Details)

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AVAILABLE-FOR-SALE AND OTHER SECURITIES AVAILABLE-FOR-SALE AND OTHER SECURITIES - Security Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Impairment losses recognized in earnings on available-for-sale securities $ 104 $ 0 $ 3,559 $ 3,687 $ 76
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]          
Balance, beginning of year 10,821 9,831 11,796 11,796 18,368
Reductions from sales (5,373) (76)   (9,931) (8,689)
Additional credit losses 104 0   3,687 76
Balance, end of year 5,552 9,755 $ 10,821 5,552 9,755
Collateralized Debt Obligations [Member]          
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Impairment losses recognized in earnings on available-for-sale securities 0 0   3,559 0
Fixed Income Securities          
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Impairment losses recognized in earnings on available-for-sale securities $ 104 $ 0   $ 128 $ 76