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REGULATORY MATTERS - Narrative (Details) $ in Millions	3 Months Ended
REGULATORY MATTERS - Narrative (Details) $ in Millions	Mar. 31, 2016 USD ($) subsidiary
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends \| $	$ 53
Banking Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of financial subsidiaries \| subsidiary	2
CBNA subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of financial subsidiaries \| subsidiary	2
Series A Preferred Stock
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends \| $	$ 7