Annual report pursuant to Section 13 and 15(d)

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

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
loan
Dec. 31, 2013
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Held For Investment, Sold $ 26,400,000    
Nonaccrual loans 11,936,000 $ 19,255,000 $ 15,000,000
Nonaccrual interest lost 487,000 795,000 778,000
Average investment in impaired loans 79,408,000 141,184,000 128,500,000
Interest income recorded on impaired loans 3,735,000 5,871,000 4,300,000
Net Income From Sale Of Loans Held For Investment $ 805,000    
Restructured loans that defaulted in the current period   24,000  
Period for restructured loan to be considered default 90 days    
Loans considered to be trouble debt restructurings $ 12,701,000 $ 26,777,000  
Number of restructured loans that defaulted in current period | loan   1  
Provision for unfunded commitments 300,000    
Acquired performing loan portfolio 5,671,462,000 $ 5,345,996,000 3,039,368,000
Acquired Performing Loan Portfolio [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchased impaired loans (gross) 90,300,000 126,300,000  
Acquired performing loan portfolio 1,400,000,000 1,800,000,000  
Remaining discount on acquired loans 20,800,000 24,300,000  
Purchased Impaired [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired performing loan portfolio $ 73,737,000 $ 105,788,000 $ 3,622,000