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
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Impairment losses recognized in earnings on available-for-sale securities $ 3,559 $ 76 $ 3,583 $ 76
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance, beginning of year 7,262 18,368 11,796 18,368
Reductions from sales 0 (8,613) (4,558) (8,613)
Additional credit losses 3,559 76 3,583 76
Balance, end of year 10,821 9,831 10,821 9,831
Trust Preferred Securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Impairment losses recognized in earnings on available-for-sale securities 3,559 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 $ 0 $ 76 $ 24 $ 76