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Repurchase Agreements - Borrowings Under Financing Arrangements and Associated Assets Pledged as Collateral (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Outstanding Repurchase Agreements $ 2,057,361 $ 1,862,063
Carrying Value of Repurchase Agreements 2,512,008 2,471,113
Value of Assets Pledged $ 3,103,105 $ 3,084,303
Weighted average months to maturity 40 days 46 days
Single Family    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Value of Assets Pledged $ 141,400 $ 146,700
Residential Loans    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Value of Assets Pledged   658,300
Residential loans and real estate owned    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Carrying Value of Repurchase Agreements 380,641 534,754
Value of Assets Pledged 466,500  
Residential loans    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Maximum Aggregate Uncommitted Principal Amount 2,225,000 2,225,000
Outstanding Repurchase Agreements 456,038 611,055
Net Deferred Finance Costs (1,391) (2,005)
Carrying Value of Repurchase Agreements 454,647 609,050
Value of Assets Pledged $ 607,904 $ 805,082
Weighted Average Rate 7.91% 7.87%
Weighted average months to maturity 12 years 9 months 25 days 13 years 10 months 20 days
Residential loans | Repurchase Agreement, Non Mark-to Market    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Outstanding Repurchase Agreements $ 103,000 $ 179,100
Weighted Average Rate 8.12% 8.19%
Weighted average months to maturity 12 months 14 months