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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2023
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 September 30, 2023:
  
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$0 $0 $0 $0 $37,085 $0 $(4,943)$32,142 
Securities of U.S. government agencies and corporations0 0 0 0 81,434 0 (15,309)66,125 
Mortgage-backed securities - residential 0 0 0 0 705,681 0 (121,198)584,483 
Mortgage-backed securities - commercial 33,399 0 (5,958)27,441 599,969 0 (50,399)549,570 
Collateralized mortgage obligations8,410 0 (1,182)7,228 488,590 0 (75,659)412,931 
Obligations of state and other political subdivisions8,177 17 (530)7,664 814,669 472 (151,398)663,743 
Asset-backed securities0 0 0 0 661,779 0 (49,679)612,100 
Other securities31,250 0 (3,738)27,512 136,889 0 (13,622)123,267 
Total$81,236 $17 $(11,408)$69,845 $3,526,096 $472 $(482,207)$3,044,361 

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 gainUnrecognized
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 - residential 0 0 0 0 747,478 47 (97,462)650,063 
Mortgage-backed securities - commercial 35,363 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 September 30, 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
By Contractual Maturity:
Due in one year or less$0 $0 $9,534 $9,435 
Due after one year through five years4,164 4,064 129,631 117,854 
Due after five years through ten years33,505 29,652 269,634 228,912 
Due after ten years1,758 1,460 661,278 529,076 
Mortgage-backed securities - residential 0 0 705,681 584,483 
Mortgage-backed securities - commercial 33,399 27,441 599,969 549,570 
Collateralized mortgage obligations8,410 7,228 488,590 412,931 
Asset-backed securities0 0 661,779 612,100 
Total$81,236 $69,845 $3,526,096 $3,044,361 
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:

 September 30, 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$2,146 $(40)$29,996 $(4,903)$32,142 $(4,943)
Securities of U.S. Government agencies and corporations0 0 66,125 (15,309)66,125 (15,309)
Mortgage-backed securities - residential 77,097 (4,853)507,386 (116,345)584,483 (121,198)
Mortgage-backed securities - commercial 14,712 (650)533,334 (49,749)548,046 (50,399)
Collateralized mortgage obligations26,373 (1,091)386,540 (74,568)412,913 (75,659)
Obligations of state and other political subdivisions95,647 (6,574)530,379 (144,824)626,026 (151,398)
Asset-backed securities28,394 (448)578,706 (49,231)607,100 (49,679)
Other securities9,713 (287)113,554 (13,335)123,267 (13,622)
Total$254,082 $(13,943)$2,746,020 $(468,264)$3,000,102 $(482,207)

 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 of HTM 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:
September 30, 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 27,441 (5,958)27,441 (5,958)
Collateralized mortgage obligations0 0 7,228 (1,182)7,228 (1,182)
Obligations of state and other political subdivisions4,656 (231)1,459 (299)6,115 (530)
Asset-backed securities0 0 0 0 0 0 
Other securities0 0 27,512 (3,738)27,512 (3,738)
Total$4,656 $(231)$63,640 $(11,177)$68,296 $(11,408)

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)