Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Liabilities
Financial instruments, whose contract amounts represent credit risk
Liability recorded for expected credit losses on unfunded commitments	$ 56,300	$ 67,200
Standby letters of credit
Financial instruments, whose contract amounts represent credit risk
Expiration period of standby letters of credit	1 year
SCBT
Financial instruments, whose contract amounts represent credit risk
Off balance sheet financial instruments	$ 9,736,791	11,203,142
SCBT | Commitments to extend credit
Financial instruments, whose contract amounts represent credit risk
Off balance sheet financial instruments	9,626,864	11,109,260
SCBT | Standby letters of credit and financial guarantees
Financial instruments, whose contract amounts represent credit risk
Off balance sheet financial instruments	$ 109,927	$ 93,882