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PREMISES, EQUIPMENT, AND CAPITAL LEASES, NET - Additional Information (Detail)
$ in Thousands
12 Months Ended
Nov. 12, 2015
USD ($)
Sep. 25, 2015
USD ($)
Branch
Dec. 31, 2015
USD ($)
Branch
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 25, 2015
USD ($)
Property, Plant and Equipment [Line Items]            
Number of branch locations sold | Branch     2      
Depreciation on premises and equipment     $ 9,154 $ 6,834 $ 4,283  
Capital leases     2,300 3,200    
Total rent expense     $ 16,400 $ 13,000 $ 7,600  
Buildings            
Property, Plant and Equipment [Line Items]            
Property book value           $ 42,300
Americas United Bank (AUB)            
Property, Plant and Equipment [Line Items]            
Number of branch locations sold | Branch   2        
Americas United Bank (AUB) | Leasehold Improvements            
Property, Plant and Equipment [Line Items]            
Net book value of properties sold   $ 47        
Americas United Bank (AUB) | Furniture, fixture and equipment            
Property, Plant and Equipment [Line Items]            
Net book value of properties sold   $ 30        
Banco Popular North America (BPNA)            
Property, Plant and Equipment [Line Items]            
Improved real property purchased $ 77,000