Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill by Operating Segments (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2024	$ 991,665
Sale of the insurance agency	(2,767)
Balance at September 30, 2024	988,898
Community Banks
Goodwill [Roll Forward]
Balance at January 1, 2024	988,898
Sale of the insurance agency	0
Balance at September 30, 2024	988,898
Insurance
Goodwill [Roll Forward]
Balance at January 1, 2024	2,767
Sale of the insurance agency	(2,767)
Balance at September 30, 2024	$ 0