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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net $ 85,694 $ 114,247 $ 93,308
Change in fair value of IRLCs 3,809 (3,089) (55)
Change in fair value of loans held for sale (11,569) 1,475 4,595
Loss on economic hedge instruments 136 (8,529) (6,592)
Other (327) (702) (865)
Gain on loans held for sale, net 77,743 103,402 90,391
MSRs Retained on Transfers of Forward Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 7,412 20,900 36,049
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 45,020 50,194 24,742
Gain on Sale of Repurchased Ginnie Mae Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 3,659 11,683 24,565
Other, Net [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net $ 29,603 $ 31,470 $ 7,952