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Contingencies - Narrative (Details)
 1 Months Ended 9 Months Ended
Apr. 20, 2017
State
States
Apr. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Loan
States
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Loan
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                
Accrued penalty     $ 53,380,000 $ 54,295,000 $ 51,057,000 $ 59,943,000 $ 117,020,000 $ 93,797,000
Number of states charging with regulatory action | States 29              
Number of states where regulatory actions were resolved | States     30          
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     $ 26,500,000     $ 40,200,000    
Warranty repurchase demands number of loans | Loan     160     213    
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            
Massachusetts Attorney General [Member]                
Loss Contingencies [Line Items]                
Injunctive and equitable relief, costs, and civil money penalties sought   $ 5,000            
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