Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Non-interest income		$ 175,851	$ 158,949
Total non-interest income from contracts with customers
Disaggregation of Revenue [Line Items]
Non-interest income		164,398	147,983
Total non-interest income from contracts with customers | Trust fees
Disaggregation of Revenue [Line Items]
Non-interest income		71,049	56,592
Total non-interest income from contracts with customers | Bank card transaction fees
Disaggregation of Revenue [Line Items]
Non-interest income		45,585	45,593
Total non-interest income from contracts with customers | Deposit account charges and other fees
Disaggregation of Revenue [Line Items]
Non-interest income		28,578	26,622
Total non-interest income from contracts with customers | Consumer brokerage services
Disaggregation of Revenue [Line Items]
Non-interest income		5,444	4,785
Total non-interest income from contracts with customers | Other non-interest income
Disaggregation of Revenue [Line Items]
Non-interest income		13,742	14,391
Other non-interest income (1)
Disaggregation of Revenue [Line Items]
Non-interest income	[1]	$ 11,453	$ 10,966

[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.