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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Estimated Fair Value of Securities
The amortized cost and estimated fair value of available-for-sale (“AFS”) investment securities were as follows:
(Dollars in thousands)Amortized
 Cost		Gross Unrealized
Gain		Gross Unrealized
Loss		Estimated
Fair Value
AFS investment securities:
June 30, 2024    
U.S. Treasury$763,352 $171 $(412)$763,111 
Agency1,583 — (57)1,526 
Corporate441,365 207 (28,910)412,662 
Collateralized mortgage obligations143,625 8 (882)142,751 
Total AFS investment securities$1,349,925 $386 $(30,261)$1,320,050 
December 31, 2023
U.S. Treasury$538,899 $381 $(24)$539,256 
Agency1,941 — (73)1,868 
Corporate481,499 52 (35,208)446,343 
Collateralized mortgage obligations153,701 — (1,097)152,604 
Total AFS investment securities$1,176,040 $433 $(36,402)$1,140,071 

The carrying amount and estimated fair value of held-to-maturity (“HTM”) investment securities were as follows:
(Dollars in thousands)Amortized
 Cost		Allowance for Credit LossesNet Carrying AmountGross Unrecognized
Gain		Gross Unrecognized
Loss		Estimated
Fair Value
HTM investment securities:
June 30, 2024
Municipal bonds$1,145,563 $(129)$1,145,434 $49 $(235,842)$909,641 
Collateralized mortgage obligations323,532 — 323,532 1,023 (11,801)312,754 
Mortgage-backed securities224,953 — 224,953 76 (36,322)188,707 
Other16,222 — 16,222 — — 16,222 
Total HTM investment securities$1,710,270 $(129)$1,710,141 $1,148 $(283,965)$1,427,324 
December 31, 2023
Municipal bonds$1,146,244 $(126)$1,146,118 $819 $(206,361)$940,576 
Collateralized mortgage obligations334,997 — 334,997 1,565 (9,570)326,992 
Mortgage-backed securities232,157 — 232,157 310 (30,798)201,669 
Other16,269 — 16,269 — — 16,269 
Total HTM investment securities$1,729,667 $(126)$1,729,541 $2,694 $(246,729)$1,485,506 
Schedule of Number, Fair Value and Gross Unrealized Holding Losses of the Company's Investment Securities by Investment Category and Length of Time that the Securities have been in a Continuous Loss Position
The table below summarizes the number, fair value, and gross unrealized holding losses of the Company’s AFS investment securities in an unrealized loss position for which an allowance for credit losses (the “ACL”) has not been recorded as of the dates indicated, aggregated by investment category and length of time in a continuous loss position.
 June 30, 2024
 Less than 12 Months12 Months or LongerTotal
(Dollars in thousands)NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses
AFS investment securities:
U.S. Treasury25 $614,355 $(412)— $— $— 25 $614,355 $(412)
Agency— — — 4 1,526 (57)4 1,526 (57)
Corporate4 39,450 (132)36 317,976 (28,778)40 357,426 (28,910)
Collateralized mortgage obligations— — — 25 125,430 (882)25 125,430 (882)
Total AFS investment securities29 $653,805 $(544)65 $444,932 $(29,717)94 $1,098,737 $(30,261)
 December 31, 2023
 Less than 12 Months12 Months or LongerTotal
(Dollars in thousands)NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses
AFS investment securities:
U.S. Treasury4 $98,622 $(24)— $— $— 4 $98,622 $(24)
Agency— — — 4 1,868 (73)4 1,868 (73)
Corporate1 4,989 (3)47 431,353 (35,205)48 436,342 (35,208)
Collateralized mortgage obligations— — — 28 152,604 (1,097)28 152,604 (1,097)
Total AFS investment securities5 $103,611 $(27)79 $585,825 $(36,375)84 $689,436 $(36,402)
Schedule of Allowance for Credit Losses on Company's Held-to-maturity Debt Securities The following table presents a rollforward by major security type of the ACL on the Company's HTM debt securities as of and for the periods indicated:
Three Months Ended June 30, 2024
(Dollars in thousands)
 Balance,
March 31, 2024
Provision (Recapture) for Credit Losses
Balance,
June 30, 2024
HTM investment securities:
Municipal bonds$115 $14 $129 
Three Months Ended June 30, 2023
(Dollars in thousands)
 Balance,
March 31, 2023
Provision (Recapture) for Credit Losses
Balance,
June 30, 2023
HTM investment securities:
Municipal bonds$227 $(114)$113 
Six Months Ended June 30, 2024
(Dollars in thousands)
 Balance,
December 31, 2023
Provision (Recapture) for Credit Losses
Balance,
June 30, 2024
HTM investment securities:
Municipal bonds$126 $3 $129 
Six Months Ended June 30, 2023
(Dollars in thousands)
 Balance,
December 31, 2022
Provision (Recapture) for Credit Losses
Balance,
June 30, 2023
HTM investment securities:
Municipal bonds$43 $70 $113 
Schedule of Realized Gain (Loss) on Investments
The following table presents the amortized cost of securities sold with related gross realized gains, gross realized losses, and net realized gains for the periods indicated:
Three Months EndedSix Months Ended
June 30,June 30,June 30,June 30,
(Dollars in thousands)2024202320242023
Amortized cost of AFS investment securities sold$— $— $— $304,182 
Gross realized gains$— $— $— $986 
Gross realized (losses)— — — (848)
Net realized gains on sales of AFS investment securities
$— $— $— $138 
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale by Contractual Maturity
The amortized cost and estimated fair value of investment securities at June 30, 2024, by contractual maturity, are shown in the table below.
Due in One Year
or Less		Due after One Year
through Five Years		Due after Five Years
through Ten Years		Due after
Ten Years		Total
(Dollars in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
AFS investment securities:          
U.S. Treasury$516,044 $515,683 $247,308 $247,428 $— $— $— $— $763,352 $763,111 
Agency— — 909 880 — — 674 646 1,583 1,526 
Corporate33,004 32,991 203,424 201,827 204,937 177,844 — — 441,365 412,662 
Collateralized mortgage obligations49 49 46,075 45,937 52,876 52,532 44,625 44,233 143,625 142,751 
Total AFS investment securities549,097 548,723 497,716 496,072 257,813 230,376 45,299 44,879 1,349,925 1,320,050 
HTM investment securities:
Municipal bonds— — 32,388 29,966 47,410 41,150 1,065,765 838,525 1,145,563 909,641 
Collateralized mortgage obligations— — 69 69 — — 323,463 312,685 323,532 312,754 
Mortgage-backed securities— — 1,923 1,971 3,469 3,495 219,561 183,241 224,953 188,707 
Other— — — — — — 16,222 16,222 16,222 16,222 
Total HTM investment securities— — 34,380 32,006 50,879 44,645 1,625,011 1,350,673 1,710,270 1,427,324 
Total investment securities$549,097 $548,723 $532,096 $528,078 $308,692 $275,021 $1,670,310 $1,395,552 $3,060,195 $2,747,374