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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2016
Buildings and improvements, including leasehold improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Buildings and improvements, including leasehold improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 40 years
Furniture and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 3 years
Furniture and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 15 years