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Loans Held for Sale - Summary of Activity in Gain on Loans Held for Sale, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net $ 114,247 $ 93,308 $ 152,970
Change in fair value of IRLCs (3,089) (55) 14
Change in fair value of loans held for sale 1,475 4,595 (8,525)
Loss on economic hedge instruments (8,529) (6,592) (8,675)
Other (702) (865) (815)
Gain on loans held for sale, net 103,402 90,391 134,969
MSRs Retained on Transfers of Forward Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 20,900 36,049 35,968
Fair Value Gains Related to Transfers of Reverse Mortgage Loans, Net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 50,194 24,742 31,857
Gain on Sale of Repurchased Ginnie Mae Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 11,683 24,565 22,960
Other, Net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net $ 31,470 $ 7,952 $ 62,185