Investments (Securities Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments [Abstract]
Gross gains on retirement/sales of investment securities available for sale	$ 33,133	$ 60,932	$ 8,993
Gross losses on sales of investment securities available for sale	(14)	(679)	(1,878)
Realized gains on investment securities available for sale, net	$ 33,119	$ 60,253	$ 7,115