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Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Cumulative probability of earning the maximum rate until maturity [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Cumulative probability of principal return prior to maturity [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Cumulative probability of default [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Liquidity risk premium [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Recovery rate in default [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Maximum [Member] Cumulative probability of earning the maximum rate until maturity [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Maximum [Member] Cumulative probability of principal return prior to maturity [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Maximum [Member] Cumulative probability of default [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Maximum [Member] Liquidity risk premium [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Maximum [Member] Recovery rate in default [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Minimum [Member] Cumulative probability of earning the maximum rate until maturity [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Minimum [Member] Cumulative probability of principal return prior to maturity [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Minimum [Member] Cumulative probability of default [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Minimum [Member] Liquidity risk premium [Member]	Mar. 31, 2013 Failed Auction Securities [Member] Level 3 [Member] Minimum [Member] Recovery rate in default [Member]
Quantitative information about Level 3 fair value measurements
Estimated Fair Value	$ 6,554	$ 6,736	$ 5,031
Valuation Technique			Discounted cash flow
Unobservable Input				Cumulative probability of earning the maximum rate until maturity	Cumulative probability of principal return prior to maturity	Cumulative probability of default	Liquidity risk premium	Recovery rate in default
Weighted Average Interest Rate				0.06%	89.55%	10.39%	5.00%	40.00%	0.11%	94.94%	15.56%	5.00%	40.00%	0.01%	84.33%	5.05%	5.00%	40.00%

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

Fair value measurement unobservable input.

+ References

No definition available.

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- Definition

Weighted average rate use to measure fair value.

+ References

No definition available.

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