Amount of investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 11
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 45
-Paragraph 12
-Subparagraph (a)
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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity Securities, FV-NI, Realized Gains, NAV Practical Expedient

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Equity Securities without Readily Determinable Fair Value, Impairment Loss and Adjustments, Cumulative Amount

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- Definition

Net Unrealized Gains, Equity Securities, Recognized in AOCI

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Investment Securities At Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Net unrealized gains related to equity securities had been recognized in AOCI					$ 9,681,000
Impairment of debt securities available for sale	$ (161,000)	$ (53,000)	$ (972,000)	$ (179,000)
Proceeds from investment securities sales			14,895,000	23,066,000
Securities that qualify for NAV	405,000		3,641,000
Equity securities without readily determinable fair value	5,428,000		5,428,000		$ 5,428,000
Impairment and other adjustments	0		0
Other current assets
Debt Securities, Available-for-sale [Line Items]
Equity securities without readily determinable fair value	428,000		428,000
Other assets
Debt Securities, Available-for-sale [Line Items]
Equity securities without readily determinable fair value	$ 5,000,000		5,000,000
Corporate Securities and U.S. Government Securities
Debt Securities, Available-for-sale [Line Items]
Maturities of debt securities			$ 18,192,000	$ 97,011,000