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Goodwill and Other Intangible Assets - Schedule of Participating Mortgage Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 521,519 | $ 494,749
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages | 511,517 | 483,356
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 10,002 | $ 11,393

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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: 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 2: 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 + Details
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