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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Summary of Held-To-Maturity and Available-For-Sale Investment Securities
The following is table a summary of HTM and AFS investment securities as of December 31, 2023:
  
Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost		Unrecognized
gain		Unrecognized
loss		Fair
value		Amortized
cost		Unrealized
gain		Unrealized
loss		Fair
value
U.S. Treasuries$0 $0 $0 $0 $34,904 $0 $(3,661)$31,243 
Securities of U.S. government agencies and corporations0 0 0 0 81,790 0 (12,010)69,780 
Mortgage-backed securities - residential0 0 0 0 744,546 2,034 (85,532)661,048 
Mortgage-backed securities - commercial32,926 0 (4,628)28,298 543,134 7 (35,911)507,230 
Collateralized mortgage obligations7,970 0 (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 securities0 0 0 0 600,055 6 (39,813)560,248 
Other securities31,250 0 (3,381)27,869 134,208 0 (13,796)120,412 
Total$80,321 $130 $(8,763)$71,688 $3,382,604 $3,842 $(365,320)$3,021,126 
The following is a summary of HTM and AFS investment securities as of December 31, 2022:
  
Held-to-maturityAvailable-for-sale
(Dollars in thousands)Amortized
cost		Unrecognized
gain		Unrecognized
loss		Fair
value		Amortized
cost		Unrealized
gain		Unrealized
loss		Fair
value
U.S. Treasuries$0 $0 $0 $0 $37,312 $0 $(4,616)$32,696 
Securities of U.S. government agencies and corporations0 0 0 0 80,382 0 (13,914)66,468 
Mortgage-backed securities - residential0 0 0 0 747,478 47 (97,462)650,063 
Mortgage-backed securities - commercial35,363 0 (4,114)31,249 676,934 2 (47,374)629,562 
Collateralized mortgage obligations9,280 0 (827)8,453 538,970 181 (61,439)477,712 
Obligations of state and other political subdivisions8,128 105 (201)8,032 832,066 565 (124,168)708,463 
Asset-backed securities0 0 0 0 772,261 39 (60,975)711,325 
Other securities31,250 0 (2,499)28,751 142,015 0 (8,656)133,359 
Total$84,021 $105 $(7,641)$76,485 $3,827,418 $834 $(418,604)$3,409,648 
Summary of Investment Securities by Estimated Maturity
The following table provides a summary of investment securities by contractual maturity as of December 31, 2023, 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
Due in one year or less$0 $0 $4,729 $4,721 
Due after one year through five years4,595 4,690 161,803 148,088 
Due after five years through ten years33,130 29,781 225,993 195,230 
Due after ten years1,700 1,488 623,600 525,913 
Mortgage-backed securities - residential 0 0 744,546 661,048 
Mortgage-backed securities - commercial 32,926 28,298 543,134 507,230 
Collateralized mortgage obligations7,970 7,431 478,744 418,648 
Asset-backed securities0 0 600,055 560,248 
Total$80,321 $71,688 $3,382,604 $3,021,126 
Age of Gross Unrealized Losses and Associated Fair Value by Investment Category
The following tables provide the fair value and gross unrealized losses on AFS investment securities in an unrealized loss position for which an allowance for credit losses was not recorded, aggregated by investment category and the length of time the individual securities have been in a continuous loss position:
 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$0 $0 $31,243 $(3,661)$31,243 $(3,661)
Securities of U.S. government agencies and corporations0 0 69,780 (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)

 December 31, 2022
 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$2,383 $(46)$30,313 $(4,570)$32,696 $(4,616)
Securities of U.S. Government agencies and corporations0 0 66,468 (13,914)66,468 (13,914)
Mortgage-backed securities - residential195,972 (10,413)443,415 (87,049)639,387 (97,462)
Mortgage-backed securities - commercial440,207 (18,823)175,530 (28,551)615,737 (47,374)
Collateralized mortgage obligations199,138 (12,453)269,242 (48,986)468,380 (61,439)
Obligations of state and other political subdivisions295,913 (31,196)368,673 (92,972)664,586 (124,168)
Asset-backed securities250,946 (9,410)422,090 (51,565)673,036 (60,975)
Other securities118,262 (6,865)9,959 (1,791)128,221 (8,656)
Total$1,502,821 $(89,206)$1,785,690 $(329,398)$3,288,511 $(418,604)
The following tables provide the fair value and gross unrealized losses on HTM investment securities in an unrealized loss position for which an allowance for credit losses was not recorded, aggregated by investment category and the length of time the individual securities have been in a continuous loss position:

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$0 $0 $0 $0 $0 $0 
Securities of U.S. government agencies and corporations0 0 0 0 0 0 
Mortgage-backed securities - residential0 0 0 0 0 0 
Mortgage-backed securities - commercial0 0 28,298 (4,628)28,298 (4,628)
Collateralized mortgage obligations0 0 7,431 (539)7,431 (539)
Obligations of state and other political subdivisions1,128 (3)1,488 (212)2,616 (215)
Asset-backed securities0 0 0 0 0 0 
Other securities0 0 27,869 (3,381)27,869 (3,381)
Total$1,128 $(3)$65,086 $(8,760)$66,214 $(8,763)

December 31, 2022
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$0 $0 $0 $0 $0 $0 
Securities of U.S. government agencies and corporations0 0 0 0 0 0 
Mortgage-backed securities - residential0 0 0 0 0 0 
Mortgage-backed securities - commercial17,656 (2,197)13,593 (1,917)31,249 (4,114)
Collateralized mortgage obligations6,317 (606)2,136 (221)8,453 (827)
Obligations of state and other political subdivisions5,160 (201)0 0 5,160 (201)
Asset-backed securities0 0 0 0 0 0 
Other securities7,081 (418)21,670 (2,081)28,751 (2,499)
Total$36,214 $(3,422)$37,399 $(4,219)$73,613 $(7,641)