Securities - Equity Securities Realized Losses (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]
Net (loss) gain on equity investments	$ (466)	$ (3,576)	$ 8,397	$ (3,273)
Less: Net gains (losses) recognized on equity securities sold	0	0	8,123	(53)
Unrealized (loss) gain recognized on equity securities still held	$ (466)	$ (3,576)	$ 274	$ (3,220)