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)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
loan
Dec. 31, 2016
USD ($)
Financing Receivable, Modifications [Line Items]          
Period for restructured loan to be considered default     90 days    
No. of Loans | loan 3   8    
Recorded Investment $ 537,000 $ 23,000 $ 1,622,000 $ 23,000  
Provision for unfunded commitments       175,000  
Total loans held for investment, net 6,898,729,000 6,148,918,000 6,898,729,000 6,148,918,000 $ 6,307,060,000
Acquired Performing Loan Portfolio          
Financing Receivable, Modifications [Line Items]          
Total loans held for investment, net 942,000,000   942,000,000   1,100,000,000
Remaining discount on acquired loans 14,600,000   14,600,000   16,900,000
Purchased Impaired          
Financing Receivable, Modifications [Line Items]          
Total loans held for investment, net 51,041,000 $ 62,346,000 51,041,000 $ 62,346,000 59,292,000
Purchased impaired loans (gross) $ 62,800,000   $ 62,800,000   73,600,000
Commercial Real Estate - Owner Occupied          
Financing Receivable, Modifications [Line Items]          
No. of Loans | loan 0 1 1 1  
Recorded Investment $ 0   $ 469,000    
Total loans held for investment, net 903,523,000 $ 857,142,000 903,523,000 $ 857,142,000 857,805,000
Commercial Real Estate - Owner Occupied | Purchased Impaired          
Financing Receivable, Modifications [Line Items]          
Total loans held for investment, net $ 17,668,000 $ 19,064,000 $ 17,668,000 $ 19,064,000 $ 18,343,000