Investment Securities (Gain (Loss) On Equity Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Unrealized gain recognized on equity securities held at the end of the period	$ 769	$ 1,660
Net gain recognized on equity securities sold during the period	0	81,815
Total gain on equity securities, net	$ 769	$ 83,475	$ (1,484)