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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Debt Instrument [Line Items]      
Long-term borrowings $ 563,495 $ 69,775 $ 71,868
Multi-Draw Term Loan [Member]      
Debt Instrument [Line Items]      
Credit Agreement borrowing capacity $ 60,000    
Maturity date Aug. 08, 2018    
Long-Term Borrowings From U.S. Bank [Member]      
Debt Instrument [Line Items]      
Long-term borrowings $ 33,500 39,800  
Long-Term Borrowings From FHLB [Member]      
Debt Instrument [Line Items]      
Long-term borrowings 530,000 $ 30,000  
Unsecured Revolving Loan [Member]      
Debt Instrument [Line Items]      
Credit Agreement borrowing capacity $ 25,000    
Maturity date Aug. 08, 2015