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FHLB ADVANCES AND LONG-TERM DEBT (Details 2) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Available borrowing capacity from unused FHLB advances $ 4,450.0 $ 5,540.0
FHLB Advances    
Debt Instrument [Line Items]    
2016 700.0  
2017 0.0  
2018 0.0  
2019 80.0  
2020 0.0  
Thereafter $ 239.4