Borrowings (Schedule Of Long-Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Maturity Date	Sep. 15, 2037
Long-term borrowings	$ 46,000us-gaap_LongTermDebt	$ 41,000us-gaap_LongTermDebt
4.00% Borrowings Due December 7, 2016 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 07, 2016
Interest Rate	4.00%
Long-term borrowings	5,000	5,000
4.60% Borrowings Due June 21, 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Jun. 21, 2017
Interest Rate	4.60%
Long-term borrowings	6,000	6,000
1.31% November 3, 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Nov. 03, 2017
Interest Rate	1.31%
Long-term borrowings	5,000
3.97% Borrowings Due December 7, 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 07, 2017
Interest Rate	3.97%
Long-term borrowings	5,000	5,000
3.66% Borrowings Due December 26, 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 26, 2017
Interest Rate	3.66%
Long-term borrowings	5,000	5,000
3.79% Borrowings Due December 26, 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Dec. 26, 2017
Interest Rate	3.79%
Long-term borrowings	5,000	5,000
1.98% Borrowings Due January 1, 2018 [Member]
Debt Instrument [Line Items]
Maturity Date	Jan. 01, 2018
Interest Rate	1.98%
Long-term borrowings		5,000
1.65% Borrowings Due July 17, 2018 [Member]
Debt Instrument [Line Items]
Maturity Date	Jul. 17, 2018
Interest Rate	1.65%
Long-term borrowings	5,000	5,000
1.83% Borrowings Due September 19, 2018 [Member]
Debt Instrument [Line Items]
Maturity Date	Sep. 19, 2018
Interest Rate	1.83%
Long-term borrowings	5,000	5,000
2.02% Borrowings Due January 31, 2019 [Member]
Debt Instrument [Line Items]
Maturity Date	Jan. 31, 2019
Interest Rate	2.02%
Long-term borrowings	$ 5,000

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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