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Contingencies - Narrative (Details)
 1 Months Ended 6 Months Ended
Jul. 31, 2017
Apr. 20, 2017
State
States
Apr. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Loan
States
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Loan
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                  
Accrued penalty       $ 54,295,000 $ 46,305,000 $ 51,057,000 $ 117,020,000 $ 82,037,000 $ 93,797,000
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       $ 29,000,000     $ 55,800,000    
Warranty repurchase demands number of loans | Loan       184     282    
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          
Ginnie Mae [Member]                  
Loss Contingencies [Line Items]                  
Forbearance period for exercising rights on guaranty agreements 90 days