Employee Benefit Plans - Schedule of Nonvested Restricted Stock Units Activity (Details) - RSUs - $ / shares		6 Months Ended
	Jan. 03, 2022	Jun. 30, 2022
Number of Shares
Beginning balance (in shares)		0
Unvested CIT RSUs converted to BancShares RSUs at Merger Date (in shares)		116,958,000,000
Unvested PSUs converted to RSUs at merger date (in shares)	10,678,000,000
Forfeited / cancelled (in shares)		(4,496,000,000)
Ending balance (in shares)		50,607,000,000
Weighted Average Grant Date Value
Beginning balance (in dollars per share)		$ 0
Unvested CIT RSUs converted to BancShares RSUs at Merger Date (in dollars per share)		859.76
Unvested CIT PSUs converted to RSUs at Merger Date (in dollars per share)	$ 859.76
Forfeited / cancelled (in dollars per share)		859.76
Ending balance (in dollars per share)		$ 859.76
Restricted Stock Unit, Settled Awards
Number of Shares
Vested (in shares)		(72,533,000,000)
Weighted Average Grant Date Value
Vested (in dollars per share)		$ 859.76