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SECURITIES - Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional $ 105,424,129 $ 96,221,329
Remaining Premium 2,384,340 2,378,411
Remaining Discount (1,259,552) (1,449,850)
Amortized Cost 71,716,117 71,231,784
Unrealized Gains 1,105,399 612,427
Unrealized Losses (1,121,339) (2,230,646)
Estimated Fair Value [1] 71,700,177 69,613,565 [2]
Total residential securities    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 105,318,085 95,996,732
Remaining Premium 2,384,197 2,378,396
Remaining Discount (1,259,545) (1,449,028)
Amortized Cost 71,609,937 71,007,994
Unrealized Gains 1,105,303 612,408
Unrealized Losses (1,121,304) (2,229,281)
Estimated Fair Value 71,593,936 69,391,121
Agency    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 91,624,518 82,895,356
Remaining Premium 2,278,964 2,287,261
Remaining Discount (1,176,387) (1,328,751)
Amortized Cost 69,238,513 67,874,312
Unrealized Gains 1,005,022 535,689
Unrealized Losses (1,093,136) (2,101,213)
Estimated Fair Value 69,150,399 66,308,788
Agency | Fixed-rate pass-through    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 64,672,312 63,444,987
Remaining Premium 1,321,720 1,448,886
Remaining Discount (1,166,717) (1,318,948)
Amortized Cost 64,827,315 63,574,925
Unrealized Gains 895,219 477,242
Unrealized Losses (929,577) (1,853,226)
Estimated Fair Value 64,792,957 62,198,941
Agency | Adjustable-rate pass-through    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 164,775 188,996
Remaining Premium 12,563 15,834
Remaining Discount (44) (51)
Amortized Cost 177,294 204,779
Unrealized Gains 2,266 1,663
Unrealized Losses (10,226) (14,953)
Estimated Fair Value 169,334 191,489
Agency | CMO    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 89,286 94,448
Remaining Premium 1,481 1,612
Remaining Discount 0 0
Amortized Cost 90,767 96,060
Unrealized Gains 0 0
Unrealized Losses (11,363) (13,088)
Estimated Fair Value 79,404 82,972
Agency | Interest-only    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 2,878,756 2,010,697
Remaining Premium 455,715 416,955
Remaining Discount 0 0
Amortized Cost 455,715 416,955
Unrealized Gains 33,559 4,729
Unrealized Losses (109,636) (157,679)
Estimated Fair Value 379,638 264,005
Agency | Multifamily    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 23,793,890 17,130,045
Remaining Premium 484,760 400,781
Remaining Discount (9,626) (9,752)
Amortized Cost 3,659,198 3,552,217
Unrealized Gains 73,978 52,055
Unrealized Losses (30,916) (59,744)
Estimated Fair Value 3,702,260 3,544,528
Agency | Reverse mortgages    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 25,499 26,183
Remaining Premium 2,725 3,193
Remaining Discount 0 0
Amortized Cost 28,224 29,376
Unrealized Gains 0 0
Unrealized Losses (1,418) (2,523)
Estimated Fair Value 26,806 26,853
Agency | Multifamily interest-only security    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 20,600,000 14,000,000
Residential credit    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 13,693,567 13,101,376
Remaining Premium 105,233 91,135
Remaining Discount (83,158) (120,277)
Amortized Cost 2,371,424 3,133,682
Unrealized Gains 100,281 76,719
Unrealized Losses (28,168) (128,068)
Estimated Fair Value 2,443,537 3,082,333
Residential credit | Credit risk transfer    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 772,924 924,729
Remaining Premium 1,712 2,240
Remaining Discount (3,707) (4,358)
Amortized Cost 770,929 922,611
Unrealized Gains 56,019 51,984
Unrealized Losses (107) (536)
Estimated Fair Value 826,841 974,059
Residential credit | Alt-A    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 172,368 164,384
Remaining Premium 36 9
Remaining Discount (1,810) (3,922)
Amortized Cost 170,594 160,471
Unrealized Gains 4,357 2,135
Unrealized Losses (6,656) (12,371)
Estimated Fair Value 168,295 150,235
Residential credit | Prime    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 1,462,881 1,076,497
Remaining Premium 15,842 8,590
Remaining Discount (10,302) (21,163)
Amortized Cost 32,195 207,077
Unrealized Gains 3,304 1,704
Unrealized Losses (536) (28,134)
Estimated Fair Value 34,963 180,647
Residential credit | Subprime    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 287,667 272,955
Remaining Premium 13 0
Remaining Discount (30,510) (31,751)
Amortized Cost 257,170 241,204
Unrealized Gains 9,785 5,622
Unrealized Losses (9,163) (11,221)
Estimated Fair Value 257,792 235,605
Residential credit | NPL/RPL    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 996,780 1,237,531
Remaining Premium 5,380 8,336
Remaining Discount (6,252) (9,224)
Amortized Cost 995,908 1,236,643
Unrealized Gains 5,265 4,578
Unrealized Losses (7,925) (43,666)
Estimated Fair Value 993,248 1,197,555
Residential credit | Prime jumbo (>=2010 vintage)    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 10,000,947 9,425,280
Remaining Premium 82,250 71,960
Remaining Discount (30,577) (49,859)
Amortized Cost 144,628 365,676
Unrealized Gains 21,551 10,696
Unrealized Losses (3,781) (32,140)
Estimated Fair Value 162,398 344,232
Residential credit | Prime interest-only    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 1,400,000 900,000
Residential credit | Prime jumbo interest-only    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 9,900,000 9,100,000
Commercial Securities    
Mortgage-Backed Securities Portfolio [Line Items]    
Principal / Notional 106,044 224,597
Remaining Premium 143 15
Remaining Discount (7) (822)
Amortized Cost 106,180 223,790
Unrealized Gains 96 19
Unrealized Losses (35) (1,365)
Estimated Fair Value $ 106,241 $ 222,444
[1]
(3)Excludes $2.0 billion and $1.5 billion at September 30, 2024 and December 31, 2023, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition. 
[2]
(1)Derived from the audited consolidated financial statements at December 31, 2023.