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Disclosure About Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Unrealized gain/(loss) (in AOCL) | $ 287,000 | $ (135,000) |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Amount by which outstanding principal amount exceeds estimated fair value | 2,022,000 | 2,678,000 | 2,309,000 | 2,543,000
Tax Increment Financing Bond [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 14,788,000 | 15,699,000 |  |
Unrealized gain/(loss) (in AOCL) | 287,000 | (135,000) |  |
Ending balance | 15,075,000 | 15,564,000 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Maturity date | Dec. 20, 2020 |  |  |
Amount by which outstanding principal amount exceeds estimated fair value | 2,000,000 |  |  |
Decrease in fair value of bond if yield-to-maturity was 100 basis points higher | 600,000 |  |  |
Increase in fair value of bond if yield-to-maturity was 100 basis points lower | 600,000 |  |  |
Fair value of Level 3 asset | $ 15,075,000 | $ 15,564,000 |  |
Discount rate (in hundredths) | 10.71% |  |  |

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- Definition The amount by which the fair value of the tax increment financing bond would increase if the yield-to-maturity were 100 basis points lower as of the balance sheet date. + References No definition available. + Details
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- Definition The amount by which the fair value of the tax increment financing bond would decrease if the yield-to-maturity were 100 basis points higher as of the balance sheet date. + References No definition available. + Details
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- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -SubTopic 10 -Topic 320 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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