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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Federal Home Loan Bank short-term borrowings $ 894,400 $ 849,100
Line of Credit Facility, Maximum Borrowing Capacity 15,000  
Commitments outstanding to extend credit 0 $ 0
Subordinated debt $ 120,000  
Subordinated Borrowing, Interest Rate 5.125%