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FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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| ASSETS | ||
| Cash and cash equivalents | $ 158,880,000 | $ 73,023,000 |
| Securities available for sale | 1,094,777,000 | 677,348,000 |
| Restricted stock | 47,204,000 | 26,036,000 |
| Loans held for sale | 62,891,000 | 53,185,000 |
| Net loans | 5,227,335,000 | 3,035,504,000 |
| Interest rate swap | 1,279,000 | 33,000 |
| Cash flow hedges | 420,000 | |
| Accrued interest receivable | 22,179,000 | 15,000,000 |
| LIABILITIES | ||
| Deposits | 5,737,808,000 | 3,238,777,000 |
| Borrowings | 522,106,000 | 443,237,000 |
| Accrued interest payable | 2,013,000 | 902,000 |
| Interest rate swap | 1,279,000 | 33,000 |
| Cash flow hedges | 5,102,000 | 3,562,000 |
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Carrying Value [Member]
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| ASSETS | ||
| Cash and cash equivalents | 158,880,000 | 73,023,000 |
| Securities available for sale | 1,094,777,000 | 677,348,000 |
| Restricted stock | 47,204,000 | 26,036,000 |
| Loans held for sale | 62,891,000 | 53,185,000 |
| Net loans | 5,201,690,000 | 3,009,233,000 |
| Interest rate swap | 1,279,000 | 33,000 |
| Cash flow hedges | 420,000 | |
| Accrued interest receivable | 22,179,000 | 15,000,000 |
| LIABILITIES | ||
| Deposits | 5,734,563,000 | 3,236,843,000 |
| Borrowings | 541,062,000 | 463,314,000 |
| Accrued interest payable | 2,013,000 | 902,000 |
| Interest rate swap | 1,279,000 | 33,000 |
| Cash flow hedges | 5,102,000 | 3,562,000 |
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Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
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| ASSETS | ||
| Cash and cash equivalents | 158,880,000 | 73,023,000 |
| Securities available for sale | ||
| Restricted stock | ||
| Loans held for sale | ||
| Net loans | ||
| Interest rate swap | ||
| Cash flow hedges | ||
| Accrued interest receivable | ||
| LIABILITIES | ||
| Deposits | ||
| Borrowings | ||
| Accrued interest payable | ||
| Interest rate swap | ||
| Cash flow hedges | ||
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Significant Other Observable Inputs Level 2 [Member]
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| ASSETS | ||
| Cash and cash equivalents | ||
| Securities available for sale | 1,094,777,000 | 677,348,000 |
| Restricted stock | 47,204,000 | 26,036,000 |
| Loans held for sale | 62,891,000 | 53,185,000 |
| Net loans | ||
| Interest rate swap | 1,279,000 | 33,000 |
| Cash flow hedges | 420,000 | |
| Accrued interest receivable | 22,179,000 | 15,000,000 |
| LIABILITIES | ||
| Deposits | 5,737,808,000 | 3,238,777,000 |
| Borrowings | 522,106,000 | 443,237,000 |
| Accrued interest payable | 2,013,000 | 902,000 |
| Interest rate swap | 1,279,000 | 33,000 |
| Cash flow hedges | 5,102,000 | 3,562,000 |
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Significant Unobservable Inputs Level 3 [Member]
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| ASSETS | ||
| Cash and cash equivalents | ||
| Securities available for sale | ||
| Restricted stock | ||
| Loans held for sale | ||
| Net loans | 5,227,335,000 | 3,035,504,000 |
| Interest rate swap | ||
| Cash flow hedges | ||
| Accrued interest receivable | ||
| LIABILITIES | ||
| Deposits | ||
| Borrowings | ||
| Accrued interest payable | ||
| Interest rate swap | ||
| Cash flow hedges | ||
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Mortgage Rate Lock Commitments [Member]
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| ASSETS | ||
| Derivative assets | 731,000 | |
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Mortgage Rate Lock Commitments [Member] | Carrying Value [Member]
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| ASSETS | ||
| Derivative assets | 731,000 | |
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Mortgage Rate Lock Commitments [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
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| ASSETS | ||
| Derivative assets | ||
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Mortgage Rate Lock Commitments [Member] | Significant Other Observable Inputs Level 2 [Member]
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| ASSETS | ||
| Derivative assets | ||
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Mortgage Rate Lock Commitments [Member] | Significant Unobservable Inputs Level 3 [Member]
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| ASSETS | ||
| Derivative assets | $ 731,000 |