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Securities, at Fair Value - Residential Mortgage Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair Value [1] $ 863,289 $ 746,090
Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 703,955 554,300
Purchase Premiums 2,403 1,824
Accretable Purchase Discounts (480) (500)
Discount Designated as Credit Reserve 0 0
Gross Amortized Cost 705,878 555,624
Gross Unrealized Gains 2,060 4,355
Gross Unrealized Losses (6,625) (835)
Net Unrealized Gain/(Loss) (4,565) 3,520
Fair Value 701,313 559,144
Other Securities    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 161,988 193,102
Purchase Premiums 16,041 19,686
Accretable Purchase Discounts (5,587) (5,637)
Discount Designated as Credit Reserve (31,514) (40,514)
Gross Amortized Cost 140,928 166,637
Gross Unrealized Gains 21,476 20,437
Gross Unrealized Losses (428) (128)
Net Unrealized Gain/(Loss) 21,048 20,309
Fair Value 161,976 186,946
Total residential mortgage securities    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 865,943 747,402
Purchase Premiums 18,444 21,510
Accretable Purchase Discounts (6,067) (6,137)
Discount Designated as Credit Reserve (31,514) (40,514)
Gross Amortized Cost 846,806 722,261
Gross Unrealized Gains 23,536 24,792
Gross Unrealized Losses (7,053) (963)
Net Unrealized Gain/(Loss) 16,483 23,829
Fair Value 863,289 746,090
CRT, Fair Value Option    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 3,400 2,300
Gross Unrealized Losses 0 0
Fair Value 52,000 51,200
Non-Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 500 500
Gross Unrealized Losses (400) (100)
Fair Value $ 23,100 $ 23,800
[1] See Note 6 for information regarding the Company’s pledged assets.