Premises and Equipment and Leases Premises and Equipment and Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Premises and Equipment [Line Items]
Premises and equipment	$ 1,171,857	$ 1,094,202
Less accumulated depreciation	537,372	471,979
Premises and equipment, net of accumulated depreciation	634,485	622,223
Depreciation Expense	68,500	68,700	$ 68,400
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Operating Leases, Payments Due, 2025	36,324
Operating Leases, Payments, 2026	33,508
Operating Leases, Payments, 2027	30,813
Operating Leases, Payments, 2028	29,390
Operating Lease, Payments, 2029	28,360
Operating Leases, Payments, 2030 and later	172,090
Total undiscounted lease payments	330,485
Less: Interest	81,821
Lease liabilities	$ 248,664
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Lease, Cost [Abstract]
Operating Lease, Right-of-Use Asset	$ 213,000	$ 221,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and equipment, net of accumulated depreciation	Premises and equipment, net of accumulated depreciation
Operating Lease, Weighted Average Remaining Lease Term	9 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	3.40%
Finance Lease, Weighted Average Remaining Lease Term	4 years 4 months 24 days
Finance Lease, Weighted Average Discount Rate, Percent	2.70%
Operating Lease, Cost	$ 26,800	$ 25,282	24,520
Variable Lease, Cost	14,962	15,327	12,845
Finance Lease, Right-of-Use Asset, Amortization	3,497	3,592	2,962
Short-term Lease, Cost	447	283	189
Operating Lease, operating cash flows	28,600	26,800	$ 23,300
Land
Premises and Equipment [Line Items]
Premises and equipment	68,816	69,121
Buildings and improvements
Premises and Equipment [Line Items]
Premises and equipment	540,832	525,941
Software and related integration
Premises and Equipment [Line Items]
Premises and equipment	270,991	219,646
Furniture and equipment
Premises and Equipment [Line Items]
Premises and equipment	245,796	211,082
Construction in progress
Premises and Equipment [Line Items]
Premises and equipment	$ 45,422	$ 68,412