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Mortgage Banking Activities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Other income   $ 19,257 $ 13,070 $ 12,436
Mortgage Banking Activities, Net   87,266 59,566 53,908
Residential Mortgage Banking Activities, Net        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Other income   1,735 2,567 2,064
Mortgage Banking Activities, Net   47,743 59,623 53,908
Residential Mortgage Banking Activities, Net | Residential loans, held-for-sale at fair value        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Changes in fair value of assets   63,527 21,808 69,373
Residential Mortgage Banking Activities, Net | Risk management derivatives, net        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Changes in fair value of risk management derivatives   (17,519) 35,248 (17,529)
Business Purpose Mortgage Banking        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Other income   16,205 0 0
Mortgage Banking Activities, Net   39,523 (57) 0
Business Purpose Mortgage Banking | Single-family rental loans, held-for-sale        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Changes in fair value of assets   17,004 453 0
Business Purpose Mortgage Banking | Risk management derivatives, net        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Changes in fair value of risk management derivatives   1,796 (510) 0
Business Purpose Mortgage Banking | Residential bridge loans        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Changes in fair value of assets $ 5,000 $ 4,518 $ 0 $ 0