Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Non-interest income		$ 147,605	$ 139,427	$ 285,217	$ 271,196
Total non-interest income from contracts with customers
Disaggregation of Revenue [Line Items]
Non-interest income		133,786	132,047	260,944	253,151
Total non-interest income from contracts with customers | Bank card transaction fees
Disaggregation of Revenue [Line Items]
Non-interest income		49,725	43,873	96,379	85,918
Total non-interest income from contracts with customers | Trust fees
Disaggregation of Revenue [Line Items]
Non-interest income		47,265	46,792	92,593	94,603
Total non-interest income from contracts with customers | Deposit account charges and other fees
Disaggregation of Revenue [Line Items]
Non-interest income		22,633	25,564	44,385	47,871
Total non-interest income from contracts with customers | Consumer brokerage services
Disaggregation of Revenue [Line Items]
Non-interest income		4,677	5,068	9,762	9,514
Total non-interest income from contracts with customers | Other non-interest income
Disaggregation of Revenue [Line Items]
Non-interest income		9,486	10,750	17,825	15,245
Other non-interest income (1)
Disaggregation of Revenue [Line Items]
Non-interest income	[1]	$ 13,819	$ 7,380	$ 24,273	$ 18,045

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