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Securitizations and Variable Interest Entities (Tables)
 9 Months Ended
Sep. 30, 2017
Transfers and Servicing [Abstract]  
Schedule of Cash Flows Related to Transfers Accounted for as Sales
The following table presents a summary of cash flows received from and paid to securitization trusts related to transfers accounted for as sales that were outstanding:
Periods ended September 30,
Three Months
 
Nine Months
2017
 
2016
 
2017
 
2016
Proceeds received from securitizations
$
687,502

 
$
1,511,991

 
$
2,711,651

 
$
3,878,461

Servicing fees collected
10,300

 
3,768

 
30,250

 
10,441

Purchases of previously transferred assets, net of claims reimbursed
(1,234
)
 
(271
)
 
(3,958
)
 
(1,051
)
 
$
696,568

 
$
1,515,488

 
$
2,737,943

 
$
3,887,851
Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance
The following table presents the carrying amounts of our assets that relate to our continuing involvement with forward loans that we have transferred with servicing rights retained as well as our maximum exposure to loss including the UPB of the transferred loans at the dates indicated:
 
September 30, 2017
 
December 31, 2016
Carrying value of assets:
 
 
 
Mortgage servicing rights, at amortized cost
$
98,314

 
$
94,492

Mortgage servicing rights, at fair value
224

 
233

Advances and match funded advances
53,683

 
37,336

UPB of loans transferred
11,905,357

 
10,485,697

Maximum exposure to loss
$
12,057,578

 
$
10,617,758