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
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ (1,802)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance, beginning of year $ 30,869 30,869 30,869  
Reductions from sales   (14,941) 0  
Credit losses not previously recognized   0 0  
Additional credit losses   2,440 0  
Balance, end of year   18,368 30,869 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   (2,440) 0 (1,466)
Private-label CMO        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Impairment losses recognized in earnings on available-for-sale securities   0 0 (336)
Total debt securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Impairment losses recognized in earnings on available-for-sale securities   (2,440) 0 (1,802)
Equity securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Impairment losses recognized in earnings on available-for-sale securities   $ 0 $ 0 $ 0