Fair Value Measurements (Summary of Gains and Losses on Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Trading Activity, Gains and Losses, Net [Line Items]
Change in unrealized gains or losses relating to assets still held at period end	$ 24,799	$ 35,333
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	24,299	43,833
Change in unrealized gains or losses relating to assets still held at period end	$ 24,799	$ 35,333