Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Non-interest income		$ 152,244	$ 147,605	$ 301,092	$ 285,217
Total non-interest income from contracts with customers
Disaggregation of Revenue [Line Items]
Non-interest income		141,896	133,786	279,006	260,944
Total non-interest income from contracts with customers | Trust fees
Disaggregation of Revenue [Line Items]
Non-interest income		52,291	47,265	103,396	92,593
Total non-interest income from contracts with customers | Bank card transaction fees
Disaggregation of Revenue [Line Items]
Non-interest income		47,477	49,725	94,407	96,379
Total non-interest income from contracts with customers | Deposit account charges and other fees
Disaggregation of Revenue [Line Items]
Non-interest income		25,325	22,633	49,476	44,385
Total non-interest income from contracts with customers | Consumer brokerage services
Disaggregation of Revenue [Line Items]
Non-interest income		4,478	4,677	8,886	9,762
Total non-interest income from contracts with customers | Other non-interest income
Disaggregation of Revenue [Line Items]
Non-interest income		12,325	9,486	22,841	17,825
Other non-interest income (1)
Disaggregation of Revenue [Line Items]
Non-interest income	[1]	$ 10,348	$ 13,819	$ 22,086	$ 24,273

[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.