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Derivative Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative Financial Instruments (Textual) [Abstract]
LIBOR period	3 months
Weighted average fixed rate	6.14%
Notional amount of interest	$ 30.5	$ 30.5
Recorded period of effectiveness of cash flow hedges on net income	12 months
Recorded period of effectiveness of fair value hedges on net income	12 months
Notional amounts of the loan agreements	$ 81.0	$ 52.2
Recorded period of effectiveness of fair value of derivatives on net income	12 months
Interest rate swap agreement, reckoning period for swaption	monthly

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- Definition

Cash flow hedge derivatives expected period of insignificant impact on net income.

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- Definition

Derivative interest rate contract frequency of swaption.

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- Definition

Fair flow hedge derivatives expected period of insignificant impact on net income.

+ References

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- Definition

LIBOR period.

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- Definition

Non designated hedge derivatives expected period of insignificant impact on net income.

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

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- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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Aggregate notional amount of all interest rate derivatives designated as hedging instruments in fair value hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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