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Securities Available For Sale (Schedule of Auction Rate Securities Redeemed and Sold) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 39 Months Ended |  |  |  |  | 3 Months Ended | 42 Months Ended |  | 3 Months Ended | 42 Months Ended |  | 3 Months Ended | 42 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Auction Rate Securities [Member] | Dec. 31, 2012 Auction Rate Securities [Member] | Jun. 30, 2013 Auction Rate Securities [Member] Fair Value [Member] | Dec. 31, 2012 Auction Rate Securities [Member] Fair Value [Member] | Jun. 30, 2013 Auction Rate Securities [Member] Asset-backed Securities [Member] | Dec. 31, 2012 Auction Rate Securities [Member] Asset-backed Securities [Member] | Dec. 31, 2012 Auction Rate Securities [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2012 Auction Rate Securities [Member] Collateralized Debt Obligations [Member] Fair Value [Member] | Jun. 30, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Fair Value [Member] | Jun. 30, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Asset-backed Securities [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Asset-backed Securities [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Asset-backed Securities [Member] Fair Value [Member] | Jun. 30, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Collateralized Debt Obligations [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Collateralized Debt Obligations [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] Collateralized Debt Obligations [Member] Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities, par value |  |  |  |  | $ 10,300,000 | $ 17,900,000 |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 |  |  | $ 2,600,000 |  |  | $ 5,000,000 |
Cumulative credit and other losses recognized in earnings, auction rate securities sold |  |  |  |  | 0 | (3,300,000) |  |  |  |  |  |  |  |  |  |  |  | (3,300,000) |  |  | 0 |  |  | (3,300,000) |
Adjusted cost basis |  |  |  |  |  | 14,600,000 | [1] |  |  | 10,300,000 | [1] | 12,900,000 | [1] | 1,700,000 | [1] |  |  | 4,300,000 |  |  | 2,600,000 |  |  | 1,700,000 |
Available-for-sale securities, gross unrealized gain (loss) |  |  |  |  |  | (200,000) |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  | (200,000) |  |  | 1,300,000 |
Auction rate securities, fair value |  |  |  |  |  |  |  | 9,300,000 | 14,400,000 |  |  |  |  |  |  | 2,700,000 |  |  | 5,400,000 |  |  | 2,400,000 |  |  | 3,000,000
Proceeds from sale or redemption of investments |  |  | 5,025,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  | 2,600,000 |  |  | 2,400,000 |  |
Reversal of unrealized (gains) losses | (388,000) | 0 | (388,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |  | (400,000) |  |  | 200,000 |  |  | (600,000) |  |
Available-for-sale securities, gross realized gains |  |  | $ (717,000) | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  | $ (700,000) |  |  | $ 0 |  |  | $ (700,000) |  |
[1] | Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. There were no adjustments to the cost basis of securities held as of June 30, 2013. Cumulative adjustments to the cost basis of securities held as of December 31, 2012 totaled $3.3 million. Par value of securities held as of June 30, 2013 and December 31, 2012 totaled $10.3 million and $17.9 million, respectively.

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- 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 + Details
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