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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