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Contingencies - Narrative (Details)
1 Months Ended 3 Months Ended
Apr. 20, 2017
State
States
Apr. 30, 2019
USD ($)
Apr. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
Loan
States
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Loan
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                
Accrued penalty       $ 52,916,000 $ 62,763,000 $ 46,305,000 $ 51,057,000  
Number of states charging with regulatory action | States 29              
Number of states where regulatory actions were resolved | States       29        
Number of loan files to be tested relating to escrow on residential real property | Loan       9,000        
Number of state attorneys general charging with regulatory action | State 2              
Warranty repurchase demands unpaid principal balance       $ 46,300,000   $ 31,400,000    
Warranty repurchase demands number of loans | Loan       273   192    
PHH Corporation [Member]                
Loss Contingencies [Line Items]                
Warranty repurchase demands unpaid principal balance       $ 26,000,000        
Warranty repurchase demands number of loans | Loan       173        
Consumer Financial Protection Bureau [Member]                
Loss Contingencies [Line Items]                
Accrued penalty               $ 12,500,000
Massachusetts Regulatory Agency [Member]                
Loss Contingencies [Line Items]                
Litigation settlement expense       $ 1,000,000        
Florida Attorney General [Member]                
Loss Contingencies [Line Items]                
Injunctive and equitable relief, costs, and civil money penalties sought     $ 10,000          
Multistate Mortgage Committee [Member]                
Loss Contingencies [Line Items]                
Accrued penalty       $ 0        
Number of states who are part of confidential supervisory memorandum of understanding | States       6        
Subsequent Event [Member] | Massachusetts Regulatory Agency [Member]                
Loss Contingencies [Line Items]                
Litigation settlement expense   $ 675,000