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Fair Value Measurement and Fair Value of Financial Instruments (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Fair Value Measurements and Fair Value of Financial Instruments [Abstract] |  |  |
Interruptions of scheduled principal payments | $ 112,000 | $ 170,000 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 8,226,000 | 8,226,000 | 11,825,000
Impaired Financing Receivable, Related Allowance | 871,000 | 871,000 | 1,085,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 2,093,000 | $ 2,093,000 | $ 2,121,000

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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