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Loans (Impaired Loans) (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Receivables [Abstract]
Interest income recorded	$ 2.1

X

- Definition

Impaired financing receivable, interest income.

+ References

No definition available.

+ Details

Name:	cit_ImpairedFinancingReceivableInterestIncome
Namespace Prefix:	cit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration