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Goodwill and Other Intangible Assets - Schedule of Participating Mortgage Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans on real estate, face amount of mortgages | $ 529,911 | $ 527,645
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans on real estate, face amount of mortgages | 520,587 | 517,863
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans on real estate, face amount of mortgages | $ 9,324 | $ 9,782

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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column F -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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