Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Period for restructured loan to be considered default 90 days    
Loans considered to be trouble debt restructurings $ 12,956,000 $ 12,701,000  
Provision for unfunded commitments 100,000    
Acquired performing loan portfolio 5,780,502,000 [1] 5,671,462,000 [1] $ 5,387,755,000
Acquired Performing Loan Portfolio [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired performing loan portfolio 1,300,000,000 1,400,000,000  
Remaining discount on acquired loans 20,000,000 20,800,000  
Purchased Impaired [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchased impaired loans (gross) 86,300,000 90,300,000  
Acquired performing loan portfolio $ 70,105,000 $ 73,737,000 $ 91,346,000
[1] Loans, as presented, are net of deferred fees and costs totaling $3.6 million and $3.0 million as of March 31, 2016 and December 31, 2015, respectively.