Investment Securities (Schedule of Available-for-Sale Investment Securities Gross Gains and Gross Losses Realized) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Realized gains on investment securities	$ 461,000	$ 1,252,000	$ 751,000
Realized losses on investment securities	(22,000)	(173,000)	(530,000)
Net realized gains on investment securities	439,000	1,079,000	221,000
Unrealized gains on equity securities with readily determinable fair value	1,154,000	2,688,000	4,265,000
Unrealized losses on equity securities with readily determinable fair value	(9,862,000)	(2,411,000)	(3,818,000)
Net unrealized (losses) gains on equity securities with readily determinable fair value	(8,708,000)	277,000	447,000
Upward adjustments of equity securities without readily determinable fair values	0	0	401,000
Downward adjustments of equity securities without readily determinable fair values	0	0	0
Impairment of equity securities without readily determinable fair values	(12,158,000)	(2,415,000)	(2,995,000)
Adjustment and impairment, net, of equity securities without readily determinable fair values	(12,158,000)	(2,415,000)	(2,594,000)
Losses on investment securities, net	(20,427,000)	(1,059,000)	(1,926,000)
Proceeds from sales of available-for-sale securities	0	192,227,000	502,250,000
Proceeds from sales of equity securities with readily determinable fair value	31,753,000	9,759,000	6,530,000
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	$ 1,330,000	$ 2,685,000	$ 1,857,000