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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oct. 16, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Credit card portfolio sold       $ 26,400,000
Net income from sale of credit card portfolio   $ 805,000    
Nonaccrual loans $ 9,973,000 11,936,000 $ 19,300,000  
Nonaccrual interest lost $ 452,000 487,000 795,000  
Period for restructured loan to be considered default 90 days      
Acquired performing loan portfolio $ 6,307,060,000 5,671,462,000 5,345,996,000  
Acquired Performing Loan Portfolio [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Acquired performing loan portfolio 1,100,000,000 1,400,000,000    
Remaining discount on acquired loans 16,900,000 20,800,000    
Purchased Impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Acquired performing loan portfolio 59,292,000 73,737,000 $ 105,788,000  
Purchased impaired loans (gross) 73,600,000 90,300,000    
Unfunded Loan Commitments        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for unfunded commitments $ 425,000 $ 300,000