Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,320,799,000	$ 1,320,799,000
Goodwill impairment	$ 0	$ 0
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	8 years
Minimum | Core Deposit Premium
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	10 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	15 years
Maximum | Core Deposit Premium
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	15 years