Investment Securities Available for Sale (Components of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 84,367	$ 84,814
Equity securities available for sale	0	65,675
Equity securities at fair value	47,202	0
Debt Securities, Trading, and Equity Securities, FV-NI	131,569	150,489
Cost		140,705
Gross Unrealized Gains		11,193
Gross Unrealized Losses		(1,409)
Fair Value	131,569
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	26,010
U.S. equity securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		44,634
Cost		35,020
Gross Unrealized Gains		10,994
Gross Unrealized Losses		(1,380)
Fair Value	47,202
Mutual funds invested in fixed income securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		21,041
Cost		20,977
Gross Unrealized Gains		93
Gross Unrealized Losses		(29)
Fair Value	21,192
Marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	84,367
Cost	84,199
Gross Unrealized Gains	168
Gross Unrealized Losses	0
Marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	84,367
Debt Securities, Trading, and Equity Securities, FV-NI		84,814
Cost		84,708
Gross Unrealized Gains		106
Gross Unrealized Losses		$ 0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Fair Value	47,202
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	26,010
Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	47,202
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds invested in fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 21,192

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

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 45
-Paragraph 1A
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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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