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Goodwill and Other Intangible Assets - Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]    
Mortgage Loans on Real Estate, Face Amount of Mortgages $ 510,843 $ 494,749
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 500,399 11,393
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 $ 10,444 $ 483,356