Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Non-interest income		$ 159,025	$ 142,949	$ 460,117	$ 428,166
Total non-interest income from contracts with customers
Disaggregation of Revenue [Line Items]
Non-interest income		146,754	134,928	425,760	395,872
Total non-interest income from contracts with customers | Trust fees
Disaggregation of Revenue [Line Items]
Non-interest income		54,689	49,207	158,085	141,800
Total non-interest income from contracts with customers | Bank card transaction fees
Disaggregation of Revenue [Line Items]
Non-interest income		47,570	46,899	141,977	143,278
Total non-interest income from contracts with customers | Deposit account charges and other fees
Disaggregation of Revenue [Line Items]
Non-interest income		25,380	23,090	74,856	67,475
Total non-interest income from contracts with customers | Consumer brokerage services
Disaggregation of Revenue [Line Items]
Non-interest income		4,619	3,820	13,505	13,582
Total non-interest income from contracts with customers | Other non-interest income
Disaggregation of Revenue [Line Items]
Non-interest income		14,496	11,912	37,337	29,737
Other non-interest income (1)
Disaggregation of Revenue [Line Items]
Non-interest income	[1]	$ 12,271	$ 8,021	$ 34,357	$ 32,294

[1] This revenue is not within the scope of ASC 606, and includes fees relating to bond trading activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions.