Annual report pursuant to Section 13 and 15(d)

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

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AVAILABLE-FOR-SALE AND OTHER SECURITIES - Security Impairment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment losses recognized in earnings on available-for-sale securities $ (2,119) $ (2,440) $ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance, beginning of year 18,368 30,869  
Reductions from sales (8,690) (14,941)  
Credit losses not previously recognized 2,119 0  
Additional credit losses 0 2,440  
Balance, end of year 11,797 18,368 30,869
Collateralized Debt Obligations      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment losses recognized in earnings on available-for-sale securities 0 (2,440) 0
Municipal Securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment losses recognized in earnings on available-for-sale securities $ (2,119) $ 0 $ 0