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FHLB ADVANCES AND LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
FHLB advances $ 1,019,424 $ 317,241
Long-term debt 206,084 225,848
FHLB Advances    
Debt Instrument [Line Items]    
Long-term debt $ 1,020,000 $ 317,200
Weighted-average rate 0.51% 0.58%
FHLB Advances | Minimum    
Debt Instrument [Line Items]    
Variable interest rate 0.51% 0.30%
FHLB Advances | Maximum    
Debt Instrument [Line Items]    
Variable interest rate 0.63% 0.58%