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 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 5,274,198,000 $ 2,973,547,000 $ 3,039,368,000  
Net interest income 63,758,000 37,753,000    
Loans and interest accrued 90 days past due 7,205,000 6,200,000 6,746,000  
Average investment in impaired loans 138,473,000   128,479,000  
Interest income recorded on impaired loans 1,372,000   4,321,000  
Nonaccrual loans 14,722,000 23,000,000 15,035,000  
Period for restructured loan to be considered default     90 days  
Recorded Investment 120,359,000   112,621,000  
Loans considered to be trouble debt restructurings 44,285,000   41,824,000  
Nonaccrual loans excluded from impaired loan     0 0
Acquired Loan Portfolio [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 2,300,000,000   377,800,000  
Remaining discount on acquired loans $ 25,500,000   $ 3,300,000