Investment Securities (Schedule of Available-for-Sale Investment Securities Gross Gains and Gross Losses Realized) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Realized gains on investment securities	$ 1,252,000	$ 751,000	$ 931,000
Realized losses on investment securities	(173,000)	(530,000)	(32,000)
Net realized gains on investment securities	1,079,000	221,000	899,000
Unrealized gains on equity securities with readily determinable fair value	2,688,000	4,265,000	3,057,000
Unrealized losses on equity securities with readily determinable fair value	(2,411,000)	(3,818,000)	(568,000)
Net unrealized gains on equity securities with readily determinable fair value	277,000	447,000	2,489,000
Upward adjustments of equity securities without readily determinable fair values	0	401,000	505,000
Downward adjustments of equity securities without readily determinable fair values	0	0	(106,000)
Impairment of equity securities without readily determinable fair values	(2,415,000)	(2,995,000)	(262,000)
Adjustment and impairment, net, of equity securities without readily determinable fair values	(2,415,000)	(2,594,000)	137,000
Other than temporary impairment charges	0	0	0
(Losses) gains on investment securities, net	(1,059,000)	(1,926,000)	3,525,000
Proceeds from sale of available-for-sale securities	192,227,000	502,250,000	972,253,000
Proceeds from sales of equity securities with readily determinable fair value	9,759,000	6,530,000	19,200,000
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	$ 2,685,000	$ 1,857,000	$ 1,764,000