Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Goodwill [Line Items]
Goodwill	$ 901,312,000		$ 901,312,000
Goodwill adjustments during period	0	$ 0
Net intangible assets	40,449,000	$ 52,417,000	43,300,000
Estimated amortization expense for 2024			11,100,000
Estimated amortization expense for 2025			10,000,000
Estimated amortization expense for 2026			8,900,000
Estimated amortization expense for 2027			7,200,000
Estimated amortization expense for 2028			4,000,000
Core Deposits
Goodwill [Line Items]
Net intangible assets	$ 38,500,000		41,200,000
Core Deposits | Minimum
Goodwill [Line Items]
Weighted average useful life (in years)	6 years
Core Deposits | Maximum
Goodwill [Line Items]
Weighted average useful life (in years)	11 years
Customer Relationships
Goodwill [Line Items]
Net intangible assets	$ 2,000,000		$ 2,100,000