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INVESTMENTS (Tables)
6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of Held-To-Maturity and Available-For-Sale Investment Securities
The following is a summary of HTM and AFS investment securities as of June 30, 2024:
  
Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost
Unrecognized gainUnrecognized lossFair
value
Amortized
cost
Unrealized
gain
Unrealized
loss
Fair
value
U.S. Treasuries$$$$$34,915 $$(3,943)$30,972 
Securities of U.S. government agencies and corporations82,501 (12,521)69,980 
Mortgage-backed securities - residential 909,468 469 (102,814)807,123 
Mortgage-backed securities - commercial 31,961 (4,891)27,070 438,738 (33,465)405,273 
Collateralized mortgage obligations7,466 (873)6,593 529,316 374 (57,225)472,465 
Obligations of state and other political subdivisions8,244 35 (325)7,954 701,945 975 (124,348)578,572 
Asset-backed securities578,931 191 (30,021)549,101 
Other securities31,250 (2,801)28,449 134,224 15 (10,967)123,272 
Total$78,921 $35 $(8,890)$70,066 $3,410,038 $2,024 $(375,304)$3,036,758 
The following is a summary of HTM and AFS investment securities as of December 31, 2023:
  
Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost
Unrecognized gainUnrecognized
loss
Fair
value
Amortized
cost
Unrealized
gain
Unrealized
loss
Fair
value
U.S. Treasuries$$$$$34,904 $$(3,661)$31,243 
Securities of U.S. government agencies and corporations81,790 (12,010)69,780 
Mortgage-backed securities - residential 744,546 2,034 (85,532)661,048 
Mortgage-backed securities - commercial 32,926 (4,628)28,298 543,134 (35,911)507,230 
Collateralized mortgage obligations7,970 (539)7,431 478,744 181 (60,277)418,648 
Obligations of state and other political subdivisions8,175 130 (215)8,090 765,223 1,614 (114,320)652,517 
Asset-backed securities600,055 (39,813)560,248 
Other securities31,250 (3,381)27,869 134,208 (13,796)120,412 
Total$80,321 $130 $(8,763)$71,688 $3,382,604 $3,842 $(365,320)$3,021,126 
Summary of Investment Securities by Estimated Maturity
The following table provides a summary of investment securities by contractual maturity as of June 30, 2024, except for residential and commercial mortgage-backed securities, collateralized mortgage obligations and asset-backed securities, which are shown as single totals due to the unpredictability of the timing in principal repayments.
 Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost
Fair
value
Amortized
cost
Fair
value
By Contractual Maturity:
Due in one year or less$$$10,536 $10,542 
Due after one year through five years5,092 5,070 159,963 146,287 
Due after five years through ten years32,747 29,909 250,521 211,774 
Due after ten years1,655 1,424 532,565 434,193 
Mortgage-backed securities - residential 909,468 807,123 
Mortgage-backed securities - commercial 31,961 27,070 438,738 405,273 
Collateralized mortgage obligations7,466 6,593 529,316 472,465 
Asset-backed securities578,931 549,101 
Total$78,921 $70,066 $3,410,038 $3,036,758 
Age of Gross Unrealized Losses and Associated Fair Value by Investment Category
The following tables provide the fair value and gross unrealized losses of AFS investment securities in an unrealized loss position for which an ACL has not been recorded, aggregated by investment category and the length of time the individual securities have been in a continuous loss position:

 June 30, 2024
 Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair
value
Unrealized
loss
Fair
value
Unrealized
loss
Fair
value
Unrealized
loss
U.S. Treasuries$$$30,972 $(3,943)$30,972 $(3,943)
Securities of U.S. Government agencies and corporations69,980 (12,521)69,980 (12,521)
Mortgage-backed securities - residential 170,664 (2,559)548,735 (100,255)719,399 (102,814)
Mortgage-backed securities - commercial 26,663 (103)358,441 (33,362)385,104 (33,465)
Collateralized mortgage obligations54,817 (167)313,966 (57,058)368,783 (57,225)
Obligations of state and other political subdivisions29,951 (361)505,236 (123,987)535,187 (124,348)
Asset-backed securities51,977 (99)314,378 (29,922)366,355 (30,021)
Other securities118,256 (10,967)118,256 (10,967)
Total$334,072 $(3,289)$2,259,964 $(372,015)$2,594,036 $(375,304)

 December 31, 2023
 Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair
value
Unrealized
loss
Fair
value
Unrealized
loss
Fair
value
Unrealized
loss
U.S. Treasuries$$$31,243 $(3,661)$31,243 $(3,661)
Securities of U.S. Government agencies and corporations69,780 (12,010)69,780 (12,010)
Mortgage-backed securities - residential31,892 (483)538,863 (85,049)570,755 (85,532)
Mortgage-backed securities - commercial1,772 (11)495,451 (35,900)497,223 (35,911)
Collateralized mortgage obligations10,699 (157)393,884 (60,120)404,583 (60,277)
Obligations of state and other political subdivisions15,155 (132)562,740 (114,188)577,895 (114,320)
Asset-backed securities6,853 (15)542,029 (39,798)548,882 (39,813)
Other securities14,605 (396)105,807 (13,400)120,412 (13,796)
Total$80,976 $(1,194)$2,739,797 $(364,126)$2,820,773 $(365,320)
The following tables provide the fair value and gross unrecognized losses of HTM investment securities in an unrecognized loss position for which an ACL has not been recorded, aggregated by investment category and the length of time the individual securities have been in a continuous loss position:
June 30, 2024
Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair
value
Unrecognized
loss
Fair
value
Unrecognized
loss
Fair
value
Unrecognized
loss
U.S. Treasuries$$$$$$
Securities of U.S. Government agencies and corporations
Mortgage-backed securities - residential
Mortgage-backed securities - commercial27,070 (4,891)27,070 (4,891)
Collateralized mortgage obligations6,593 (873)6,593 (873)
Obligations of state and other political subdivisions3,368 (75)2,554 (250)5,922 (325)
Asset-backed securities
Other securities28,449 (2,801)28,449 (2,801)
Total$3,368 $(75)$64,666 $(8,815)$68,034 $(8,890)

December 31, 2023
Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair
value
Unrecognized
loss
Fair
value
Unrecognized
loss
Fair
value
Unrecognized
loss
U.S. Treasuries$$$$$$
Securities of U.S. Government agencies and corporations
Mortgage-backed securities - residential
Mortgage-backed securities - commercial28,298 (4,628)28,298 (4,628)
Collateralized mortgage obligations7,431 (539)7,431 (539)
Obligations of state and other political subdivisions1,128 (3)1,488 (212)2,616 (215)
Asset-backed securities
Other securities27,869 (3,381)27,869 (3,381)
Total$1,128 $(3)$65,086 $(8,760)$66,214 $(8,763)