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Loans and Investments (Details 5) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) loan item | Dec. 31, 2014 USD ($) loan item
Non-performing loans by asset class |  |
Number of loans | item | 146 | 139
Carrying value of loans before loan loss reserves | $ 1,595,706,784 | $ 1,587,429,498
Non-performing loans |  |
Non-performing loans by asset class |  |
Number of loans | item | 3 | 3
Carrying value of loans before loan loss reserves | $ 6,500,000 | $ 7,000,000
Loan loss reserves | $ 34,500,000 | $ 34,000,000
Number of loans classified as non-performing which have loan loss reserve | loan | 2 | 2
Carrying Value | $ 41,043,519 | $ 41,043,556
Less Than 90 Days Past Due |  | 765,799
Greater Than 90 Days Past Due | 41,043,519 | 40,277,757
Multifamily | Non-performing loans |  |
Non-performing loans by asset class |  |
Carrying Value | 32,765,799 | 32,765,799
Less Than 90 Days Past Due |  | 765,799
Greater Than 90 Days Past Due | 32,765,799 | 32,000,000
Office | Non-performing loans |  |
Non-performing loans by asset class |  |
Carrying Value | 8,277,720 | 8,277,757
Greater Than 90 Days Past Due | $ 8,277,720 | $ 8,277,757

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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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