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Goodwill and Other Intangible Assets - Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
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