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Subsequent Events - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 27, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Cumulative-effect adjustment on retained earnings, before tax     $ 300  
Senior notes, net     $ 347,338 $ 346,789
Common stock, par value per share     $ 0.01 $ 0.01
Government Insured Servicing Rights [Member]        
Subsequent Event [Line Items]        
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance     $ 24,800  
UPB of MSRs for which fair value election was made     16,900,000  
Mortgage servicing rights, at amortized cost     133,200  
Agency MSRs [Member]        
Subsequent Event [Line Items]        
UPB of MSRs for which fair value election was made     24,000,000  
Mortgage servicing rights, at amortized cost     $ 203,700  
Subsequent Event [Member] | PHH Corporation [Member]        
Subsequent Event [Line Items]        
Merger consideration to be paid in acquisition $ 360,000      
Estimated cash outflow related to acquisition 74,000      
Senior notes, net $ 119,000      
Common stock, par value per share $ 0.01      
Common stock, conversion into right to receive cash $ 11.00      
Subsequent Event [Member] | PHH Corporation [Member] | Senior Notes Due 2019 [Member]        
Subsequent Event [Line Items]        
Senior notes, net $ 97,000      
Debt instrument, interest rate 7.375%      
Subsequent Event [Member] | PHH Corporation [Member] | Senior Notes Due 2021 [Member]        
Subsequent Event [Line Items]        
Senior notes, net $ 22,000      
Debt instrument, interest rate 6.375%      
Subsequent Event [Member] | Fair Value Agency Mortgage Servicing Rights [Member]        
Subsequent Event [Line Items]        
Cumulative-effect adjustment on retained earnings, before tax   $ 82,000