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Investment Securities (Tables)
3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Investment Securities
Our available-for-sale investment securities were as follows:
Amortized costGross unrealized gainsGross unrealized lossesFair value
(In thousands)
March 31, 2024
Corporate bonds$10,000 $ $(333)$9,667 
Agency bond securities240,492  (41,965)198,527 
Agency mortgage-backed securities2,292,157  (344,683)1,947,474 
Municipal bonds29,309  (6,005)23,304 
Total investment securities$2,571,958 $ $(392,986)$2,178,972 
December 31, 2023
Corporate bonds$10,000 $— $(374)$9,626 
Agency bond securities240,447 — (40,217)200,230 
Agency mortgage-backed securities2,337,411 — (333,901)2,003,510 
Municipal bonds29,408 — (5,773)23,635 
Total investment securities$2,617,266 $— $(380,265)$2,237,001 
Schedule of Available-for-sale Securities, Unrealized Loss Position
As of March 31, 2024 and December 31, 2023, the gross unrealized losses and fair values of available-for-sale investment securities that were in unrealized loss positions were as follows:
Less than 12 months12 months or moreTotal fair valueTotal unrealized loss
Fair valueUnrealized lossFair valueUnrealized loss
(In thousands)
March 31, 2024
Corporate bonds$ $ $9,667 $(333)$9,667 $(333)
Agency bond securities  198,527 (41,965)198,527 (41,965)
Agency mortgage-backed securities2,219 (1)1,945,250 (344,682)1,947,469 (344,683)
Municipal bonds  23,304 (6,005)23,304 (6,005)
Total investment securities$2,219 $(1)$2,176,748 $(392,985)$2,178,967 $(392,986)
December 31, 2023
Corporate bonds$— $— $9,626 $(374)$9,626 $(374)
Agency bond securities— — 200,230 (40,217)200,230 (40,217)
Agency mortgage-backed securities— — 2,001,270 (333,901)2,001,270 (333,901)
Municipal bonds— — 23,636 (5,773)23,636 (5,773)
Total investment securities$— $— $2,234,762 $(380,265)$2,234,762 $(380,265)
Schedule of Maturity Dates for Available-for-Sale Investment Securities
As of March 31, 2024, the contractual maturities of our available-for-sale investment securities were as follows:
Amortized costFair value
(In thousands)
Due in one year or less$60,691 $60,117 
Due after one year through five years81,268 72,799 
Due after five years through ten years144,224 117,497 
Due after ten years54,309 41,202 
Mortgage and asset-backed securities2,231,466 1,887,357 
Total investment securities$2,571,958 $2,178,972