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Contingencies - Narrative (Details)
1 Months Ended 9 Months Ended
Apr. 20, 2017
State
States
Apr. 30, 2019
USD ($)
Apr. 30, 2017
USD ($)
Sep. 30, 2019
USD ($)
Loan
States
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Loan
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                    
Accrued penalty       $ 38,959,000 $ 53,072,000 $ 62,763,000 $ 53,380,000 $ 54,295,000 $ 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       $ 49,900,000     $ 26,500,000      
Warranty repurchase demands number of loans | Loan       289     160      
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   $ 675,000   $ 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