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Securitizations and Variable Interests Entities (Tables)
 12 Months Ended
Dec. 31, 2016
Transfers and Servicing [Abstract]  
Summary of Cash Flows Received from and Paid to Securitization Trusts Related to Transfers Accounted for as Sales Outstanding
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 during the years ended December 31:
 
2016
 
2015
 
2014
Proceeds received from securitizations
$
5,197,071

 
$
4,970,454

 
$
5,265,183

Servicing fees collected
14,616

 
29,239

 
25,438

Purchases of previously transferred assets, net of claims reimbursed
(1,271
)
 
(2,863
)
 
4,973

 
$
5,210,416

 
$
4,996,830

 
$
5,295,594
Schedule of Carrying Amounts of Assets that Relate to Continuing Involvement with Transferred Forward Loans
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 December 31:
 
2016
 
2015
Carrying value of assets:
 
 
 
Mortgage servicing rights, at amortized cost
$
94,492

 
$
54,729

Mortgage servicing rights, at fair value
233

 
236

Advances and match funded advances
37,336

 
26,968

UPB of loans transferred
10,485,697

 
7,471,025

Maximum exposure to loss
$
10,617,758

 
$
7,552,958