Securities (Summary of Gross Unrealized Gains and Gross Unrealized Losses on Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Gains recognized during the period on equity securities	$ 0	$ 0	$ 0	$ 16,425
Less: Gains recognized during the period on equity securities sold during the period	0	0	0	3,000
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date	$ 0	$ 0	$ 0	$ 13,425