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Acquisition and Divestiture Activity - Total Consideration (Details) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended	9 Months Ended
	Apr. 01, 2024	Jun. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Assets
Goodwill		$ 2,170,709,000	$ 2,176,999,000	$ 1,998,716,000	$ 1,998,716,000	$ 1,998,716,000	$ 1,998,716,000
Fair value of consideration
Issuance of common stock (in shares)		417,598,000	$ 417,598,000	$ 0
Common Stock
Fair value of consideration
Issuance of common stock (in shares)	$ 24,014,000	$ 24,014,000
Share price (in dollars per share)	$ 17.41
CapStar Financial Holdings, Inc.
Assets
Cash and cash equivalents	$ 177,791,000
Investment securities	342,490,000
FHLB/Federal Reserve Bank stock	14,426,000
Loans held-for-sale	21,159,000
Loans, net of allowance for credit losses	2,120,627,000
Premises and equipment	22,481,000
Goodwill	178,283,000
Other intangible assets	46,125,000
Company-owned life insurance	91,475,000
Other assets	94,312,000
Total assets	3,109,169,000
Liabilities
Deposits	2,560,124,000
Federal Home Loan Bank advances	75,000,000
Other borrowings	30,000,000
Accrued expenses and other liabilities	26,447,000
Total liabilities	2,691,571,000
Fair value of consideration
Total consideration	$ 417,598,000
CapStar Financial Holdings, Inc. | Common Stock
Fair value of consideration
Issuance of common stock shares for acquisitions of business (in shares)	417,598

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