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Transactions with Affiliates - Amounts due from Investment Funds (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment Funds        
Amounts due from affiliate        
Cash received during the period $ 8,187 $ 61,314    
Carried Interest from Investment Funds   8,552 $ 70,906 $ 69,926
Mortgage loan servicing rebate deposit   300    
Management fees   88    
Expense reimbursements   27    
Mortgage loan servicing fees   2    
Total due from affiliate   417    
Deposits received to fund servicing advances   2,329    
Other   98    
Payable to affiliates   2,427    
Investment Funds | Minimum        
Amounts due from affiliate        
Base management fees, annual accrual rate 1.50%      
Investment Funds | Maximum        
Amounts due from affiliate        
Base management fees, annual accrual rate 2.00%      
PNMAC Mortgage Opportunity Fund, LLC        
Amounts due from affiliate        
Carried Interest from Investment Funds   6,389    
PNMAC Mortgage Opportunity Fund Investors, LLC        
Amounts due from affiliate        
Carried Interest from Investment Funds   $ 2,163