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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net $ 37,532 $ 45,287 $ 68,028
Change in fair value of IRLCs 756 3,809 (3,089)
Change in fair value of loans held for sale 3,005 (11,569) 1,475
Loss on economic hedge instruments (2,689) 136 (8,529)
Other (304) (327) (702)
Gain on loans held for sale, net 38,300 37,336 57,183
MSRs Retained on Transfers of Forward Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 7,458 7,412 20,900
Forward Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net 25,310 34,216 35,445
Gain on Sale of Repurchased Ginnie Mae Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales of loans, net $ 4,764 $ 3,659 $ 11,683