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Contingencies - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 18, 2018
Jul. 31, 2017
Apr. 20, 2017
State
States
Apr. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Loan
States
Sep. 30, 2017
States
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                  
Accrued penalty         $ 46,305,000   $ 51,057,000 $ 82,037,000 $ 93,797,000
Number of states charging with regulatory action | States     30            
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         $ 31,400,000     $ 45,400,000  
Warranty repurchase demands number of loans | Loan         192     249  
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              
Extended forbearance period for exercising rights on guaranty agreements         90 days        
Ginnie Mae [Member] | Subsequent Event [Member]                  
Loss Contingencies [Line Items]                  
Maximum period that regulator has indicated to complete evaluation 90 days