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Securities, at Fair Value - Residential Mortgage Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair Value [1] $ 1,140,036 $ 746,090
Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 977,285 554,300
Purchase Premiums 5,268 1,824
Accretable Purchase Discounts (460) (500)
Discount Designated as Credit Reserve 0 0
Gross Amortized Cost 982,093 555,624
Gross Unrealized Gains 11,601 4,355
Gross Unrealized Losses (223) (835)
Net Unrealized Gain/(Loss) 11,378 3,520
Fair Value 993,471 559,144
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 147,318 193,102
Purchase Premiums 14,099 19,686
Accretable Purchase Discounts (5,627) (5,637)
Discount Designated as Credit Reserve (23,691) (40,514)
Gross Amortized Cost 132,099 166,637
Gross Unrealized Gains 14,471 20,437
Gross Unrealized Losses (5) (128)
Net Unrealized Gain/(Loss) 14,466 20,309
Fair Value 146,565 186,946
Total residential mortgage securities    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 1,124,603 747,402
Purchase Premiums 19,367 21,510
Accretable Purchase Discounts (6,087) (6,137)
Discount Designated as Credit Reserve (23,691) (40,514)
Gross Amortized Cost 1,114,192 722,261
Gross Unrealized Gains 26,072 24,792
Gross Unrealized Losses (228) (963)
Net Unrealized Gain/(Loss) 25,844 23,829
Fair Value 1,140,036 746,090
CRT securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 3,300 2,300
Gross Unrealized Losses 0 0
Fair Value 51,800 51,200
Non-agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 1,000 500
Gross Unrealized Losses 0 (100)
Fair Value $ 23,800 $ 23,800
[1] See Note 6 for information regarding the Company’s pledged assets.