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Investment Securities At Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Sale of investment securities			$ 12,942,000	$ 2,647,000
Securities that qualify for NAV	$ 1,911,000	$ 1,505,000	5,470,000	3,236,000
Equity securities without readily determinable fair value	5,000,000		5,000,000		$ 5,000,000
Impairment and other adjustments	0	$ 0	0	0
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Securities that qualify for NAV	$ 215,000		649,000
Corporate Securities and U.S. Government Securities
Debt Securities, Available-for-sale [Line Items]
Maturities of debt securities			$ 29,155,000	$ 11,526,000