Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 21,743,000 $ 9,973,000 11,900,000  
Nonaccrual interest lost $ 698,000 452,000 487,000  
Period for restructured loan to be considered default 90 days      
Acquired performing loan portfolio $ 7,141,552,000 6,307,060,000 5,671,462,000  
Acquired Performing Loan Portfolio        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Acquired performing loan portfolio 892,400,000 1,100,000,000    
Remaining discount on acquired loans 13,700,000 16,900,000    
Purchased Impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Acquired performing loan portfolio 39,021,000 59,292,000 73,737,000  
Purchased impaired loans (gross) 47,900,000 73,600,000    
Unfunded Loan Commitments        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for unfunded commitments $ (315,000) $ 425,000 $ 300,000