SIGNIFICANT ACCOUNTING POLICIES - Premises (Details)	12 Months Ended
	Dec. 31, 2019
Computer software
Premises and Equipment
Useful life, Finite lived intangible assets	3 years
Building
Premises and Equipment
Useful life, Property plant and equipment	40 years
Leasehold improvements | Minimum
Premises and Equipment
Useful life, Property plant and equipment	3 years
Leasehold improvements | Maximum
Premises and Equipment
Useful life, Property plant and equipment	20 years
Furniture, fixtures, and equipment | Minimum
Premises and Equipment
Useful life, Property plant and equipment	5 years
Furniture, fixtures, and equipment | Maximum
Premises and Equipment
Useful life, Property plant and equipment	7 years
Computer equipment | Minimum
Premises and Equipment
Useful life, Property plant and equipment	4 years
Computer equipment | Maximum
Premises and Equipment
Useful life, Property plant and equipment	5 years