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Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
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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.

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