Investment Securities (Gross Realized Gains and Losses on Investment Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Gross realized gains on sales	$ 329	$ 144	$ 4
Gross realized losses on sales	(219)	(9)	(38)
Net gains (losses) recognized on debt securities available for sale	110	135	(34)
Impairment expense	(415)	(15)	(1,087)
Equity securities at fair value	78,599	91,977
Net losses recognized on investment securities	2,123	7,320	(8,449)
Net losses recognized equity securities	(121)	1,526	(808)
Net unrealized gains (losses) recognized on equity securities still held at the reporting date	2,244	5,794	$ (7,641)
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	21,155	23,819
Marketable equity securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	21,155	23,819
Mutual funds invested in fixed income securities
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	23,226	22,377
Mutual funds invested in fixed income securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Equity securities at fair value	$ 23,226	$ 22,377

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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Amount of unrealized gain (loss) on 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
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-SubTopic 220
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-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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Other-than-temporary Impairment Loss, Debt and Equity Securities, Available-for-sale

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