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Goodwill and Other Intangible Assets - Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
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