Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 901,312,000		$ 901,312,000
Goodwill adjustments during period	0	$ 0
Accumulated impairment loss	0
Net intangible assets	52,417,000	$ 65,978,000	55,600,000
Estimated amortization expense for 2023			12,300,000
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
Core Deposits
Goodwill [Line Items]
Net intangible assets	$ 50,100,000		53,200,000
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	$ 2,300,000		$ 2,400,000