| LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
| Jun. 30, 2014
 loan | Jun. 30, 2013
 loan | Jun. 30, 2014
 loan | Jun. 30, 2013
 loan | Dec. 31, 2013 | |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Loans | $ 5,233,069,000 | $ 3,000,855,000 | $ 5,233,069,000 | $ 3,000,855,000 | $ 3,039,368,000 | 
| Loans and interest accruing 90 days past due | 6,870,000 | 6,870,000 | 6,746,000 | ||
| Average investment in impaired loans | 133,900,000 | 128,479,000 | |||
| Interest income recorded on impaired loans | 2,465,000 | 4,321,000 | |||
| Nonaccrual loans | 23,099,000 | 23,099,000 | 15,035,000 | ||
| Period for restructured loan to be considered default | 90 days | ||||
| Recorded Investment | 115,913,000 | 115,913,000 | 112,621,000 | ||
| Loans considered to be trouble debt restructurings | 34,171,000 | 34,171,000 | 41,824,000 | ||
| Nonaccrual loans excluded from impaired loan disclosure | 0 | 0 | 0 | ||
| Restructured loans that defaulted in the current period | 24,000 | 43,000 | 24,000 | 43,000 | |
| Number of restructured loans that defaulted in current period | 1 | 1 | 1 | 1 | |
| Acquired Loan Portfolio [Member] | |||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Loans | 2,200,000,000 | 2,200,000,000 | 377,800,000 | ||
| Remaining discount on acquired loans | $ 25,700,000 | $ 25,700,000 | $ 3,300,000 | ||
| X | ||||||||||
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- Definition Non accrual loans excluded from impaired loans. No definition available. 
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- Definition Number of financing receivable modifications defaulted during period. No definition available. 
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- Definition Period for restructured loan to be considered default No definition available. 
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- Definition Remaining discount on acquired loans No definition available. 
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- Details 
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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