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           COMMITMENTS AND CONTINGENCIES (Balances of Commitments and Contingencies) (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Sep. 30, 2014 
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           Dec. 31, 2013 
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| Commitments with off-balance sheet risk: | ||||||
| Total commitments with off-balance sheet risk | $ 1,785,852 | $ 994,621 | ||||
| Commitments with balance sheet risk: | ||||||
| Loans held for sale | 31,469 | 53,185 | ||||
| Total other commitments | 1,817,321 | 1,047,806 | ||||
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           Commitments to Extend Credit [Member] 
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| Commitments with off-balance sheet risk: | ||||||
| Total commitments with off-balance sheet risk | 1,576,050 | [1] | 891,680 | [1] | ||
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           Standby Letters of Credit [Member] 
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| Commitments with off-balance sheet risk: | ||||||
| Total commitments with off-balance sheet risk | 139,459 | 48,107 | ||||
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           Interest Rate Lock Commitments [Member] 
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| Commitments with off-balance sheet risk: | ||||||
| Total commitments with off-balance sheet risk | $ 70,343 | $ 54,834 | ||||
          
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- Definition 
          Loans held for sale net with balance sheet risk. No definition available. 
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- Definition 
          The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available. 
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