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BUSINESS COMBINATIONS AND BRANCH SALES - Building Sale (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 25, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |
Proceeds from sale of premises and equipment |  | $ 50,639 | $ 79 | $ 0
Gain on sale of building |  | $ 9,919 | $ 0 | $ 0
Buildings |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Proceeds from sale of premises and equipment | $ 52,300 |  |  |
Gain on sale of building | 9,900 |  |  |
Property book value | 42,300 |  |  |
Buildings | Professional Fees And All Other Expenses |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Selling costs | $ 2,300 |  |  |

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