Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Trust Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Trust Fees [Line Items]
Trust fees	$ 190,954	$ 184,719	$ 188,227
Private Client [Member]
Trust Fees [Line Items]
Trust fees	153,524	147,239	147,653
Institutional [Member]
Trust Fees [Line Items]
Trust fees	31,756	31,525	33,890
Other Trust Fees [Member]
Trust Fees [Line Items]
Trust fees	$ 5,674	$ 5,955	$ 6,684