Investment Securities At Fair Value (Components of Investment Securities At Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Debt securities available for sale	$ 77,279	$ 84,814
Equity securities available for sale	0	65,675
Equity securities at fair value	61,537	0
Total investment securities at fair value	138,816	150,489
Net unrealized gains related to equity securities had been recognized in AOCI		9,681
Cost	77,273	140,705
Gross Unrealized Gains	6	11,193
Gross Unrealized Losses	0	(1,409)
Net losses recognized on equity securities	(2,745)
Less: Net gains recognized on equity securities sold	130
Net unrealized losses recognized on equity securities still held at the reporting date	(2,875)
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Total investment securities at fair value		44,634
Cost		35,020
Gross Unrealized Gains		10,994
Gross Unrealized Losses		(1,380)
Mutual funds invested in fixed-income securities
Schedule of Available-for-sale Securities [Line Items]
Total investment securities at fair value		21,041
Cost		20,977
Gross Unrealized Gains		93
Gross Unrealized Losses		(29)
Marketable debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities available for sale	77,279
Total investment securities at fair value		84,814
Cost	77,273	84,708
Gross Unrealized Gains	6	106
Gross Unrealized Losses	0	0
Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Fair Value	138,816	150,489
Fair Value, Measurements, Recurring \| Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	40,561
Fair Value, Measurements, Recurring \| Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	61,537	44,634
Fair Value, Measurements, Recurring \| Mutual funds invested in fixed-income securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	20,976	21,041
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Fair Value	61,537	65,675
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	40,561
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	61,537	44,634
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Mutual funds invested in fixed-income securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 20,976	$ 21,041

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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