Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 901,312,000		$ 901,312,000	$ 901,312,000
Goodwill adjustments during period	0	$ 0
Accumulated impairment loss	0		0
Net intangible assets	49,362,000	$ 62,500,000	49,362,000	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	47,200,000		$ 47,200,000	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	$ 2,200,000		$ 2,200,000	$ 2,400,000