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Fair Value - Schedule of Reconciliation of Changes in Fair Value of Level 3 Assets and Liabilities (Details) - Level 3 [Member] - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 281,594,000 $ 343,662,000
Purchases, issuances, sales and settlements    
Purchases 2,378,000 0
Issuances (253,083,000) 39,625,000
Transfer from MSRs carried at amortized cost, net of valuation allowance 336,882,000  
Cumulative effect of MSR fair value election 82,043,000  
Transfer to Loans held for sale, at fair value (184,000)  
Sales (131,000) (228,000)
Transfers to Other assets (104,000)  
Transfers to Receivables, net (50,000)  
Settlements 52,268,000 11,808,000
Purchases, issuances, sales and settlements, total 220,019,000 51,205,000
Total realized and unrealized gains and (losses):    
Change in fair value 9,519,000 (14,025,000)
Calls and other 694,000 0
Total realized and unrealized gains (losses) included in earnings 10,213,000 (14,025,000)
Transfers in and / or out of Level 3 0 0
Ending balance 511,826,000 380,842,000
Loans Held for Investment [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 4,715,831,000 3,565,716,000
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 251,086,000 347,080,000
Transfer to Loans held for sale, at fair value (184,000)  
Sales 0 0
Transfers to Other assets (104,000)  
Transfers to Receivables, net (50,000)  
Settlements (82,719,000) (80,290,000)
Purchases, issuances, sales and settlements, total 168,029,000 266,790,000
Total realized and unrealized gains and (losses):    
Change in fair value 104,291,000 83,881,000
Calls and other 0 0
Total realized and unrealized gains (losses) included in earnings 104,291,000 83,881,000
Transfers in and / or out of Level 3 0 0
Ending balance 4,988,151,000 3,916,387,000
HMBS - Related Borrowings [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (4,601,556,000) (3,433,781,000)
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances (222,825,000) (306,749,000)
Transfer to Loans held for sale, at fair value 0  
Sales 0 0
Transfers to Other assets 0  
Transfers to Receivables, net 0  
Settlements 80,811,000 75,099,000
Purchases, issuances, sales and settlements, total (142,014,000) (231,650,000)
Total realized and unrealized gains and (losses):    
Change in fair value (94,623,000) (73,834,000)
Calls and other 0 0
Total realized and unrealized gains (losses) included in earnings (94,623,000) (73,834,000)
Transfers in and / or out of Level 3 0 0
Ending balance (4,838,193,000) (3,739,265,000)
Mortgage-Backed Securities [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,592,000 8,342,000
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Transfer to Loans held for sale, at fair value 0  
Sales 0 0
Transfers to Other assets 0  
Transfers to Receivables, net 0  
Settlements 0 0
Purchases, issuances, sales and settlements, total 0 0
Total realized and unrealized gains and (losses):    
Change in fair value 87,000 316,000
Calls and other 0 0
Total realized and unrealized gains (losses) included in earnings 87,000 316,000
Transfers in and / or out of Level 3 0 0
Ending balance 1,679,000 8,658,000
Financing Liability - MSRs Pledged [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (508,291,000) (477,707,000)
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances (279,586,000) 0
Transfer to Loans held for sale, at fair value 0  
Sales 0 0
Transfers to Other assets 0  
Transfers to Receivables, net 0  
Settlements 54,547,000 16,999,000
Purchases, issuances, sales and settlements, total (225,039,000) 16,999,000
Total realized and unrealized gains and (losses):    
Change in fair value 16,712,000 1,521,000
Calls and other 694,000 0
Total realized and unrealized gains (losses) included in earnings 17,406,000 1,521,000
Transfers in and / or out of Level 3 0 0
Ending balance (715,924,000) (459,187,000)
Derivatives [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,056,000 1,836,000
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Transfer to Loans held for sale, at fair value 0  
Sales 0 0
Transfers to Other assets 0  
Transfers to Receivables, net 0  
Settlements (371,000) 0
Purchases, issuances, sales and settlements, total (371,000) 0
Total realized and unrealized gains and (losses):    
Change in fair value 181,000 426,000
Calls and other 0 0
Total realized and unrealized gains (losses) included in earnings 181,000 426,000
Transfers in and / or out of Level 3 0 0
Ending balance 1,866,000 2,262,000
MSRs [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 671,962,000 679,256,000
Purchases, issuances, sales and settlements    
Purchases 2,378,000 0
Issuances (1,758,000) (706,000)
Transfer from MSRs carried at amortized cost, net of valuation allowance 336,882,000  
Cumulative effect of MSR fair value election 82,043,000  
Transfer to Loans held for sale, at fair value 0  
Sales (131,000) (228,000)
Transfers to Other assets 0  
Transfers to Receivables, net 0  
Settlements 0 0
Purchases, issuances, sales and settlements, total 419,414,000 (934,000)
Total realized and unrealized gains and (losses):    
Change in fair value (17,129,000) (26,335,000)
Calls and other 0 0
Total realized and unrealized gains (losses) included in earnings (17,129,000) (26,335,000)
Transfers in and / or out of Level 3 0 0
Ending balance $ 1,074,247,000 $ 651,987,000