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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale
The amortized cost and estimated fair value of securities available-for-sale along with allowance for credit losses, gross unrealized gains and losses are summarized as follows:

(dollars in thousands)
Securities available-for-sale		Amortized CostAllowance for Credit LossesGross Unrealized GainsGross Unrealized Losses
Estimated
Fair
Value
December 31, 2023
U.S. Treasuries$732,636 $— $34 $(11,793)$720,877 
U.S. government-sponsored agencies1,023 — — (38)985 
State, county and municipal securities28,986 — 9 (944)28,051 
Corporate debt securities10,946 (69)— (850)10,027 
SBA pool securities53,033 — 2 (1,519)51,516 
Mortgage-backed securities621,013 — 67 (29,592)591,488 
Total debt securities available-for-sale$1,447,637 $(69)$112 $(44,736)$1,402,944 
December 31, 2022
U.S. Treasuries$775,784 $— $131 $(16,381)$759,534 
U.S. government-sponsored agencies1,036 — — (57)979 
State, county and municipal securities35,358 — 17 (1,180)34,195 
Corporate debt securities16,397 (75)— (396)15,926 
SBA pool securities29,422 — 3 (2,027)27,398 
Mortgage-backed securities701,008 — 113 (39,093)662,028 
Total debt securities available-for-sale$1,559,005 $(75)$264 $(59,134)$1,500,060 
The following table is a summary of sales activities in the Company's investment securities available for sale:
For the Years Ended December 31,
(dollars in thousands)202320222021
Gross losses on sales of securities $(310)$— $— 
Net realized losses on sales of securities available for sale $(310)$— $— 
Sales proceeds$5,141 $— $— 
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities Held-to-Maturity
The amortized cost and estimated fair value of securities held-to-maturity along with gross unrealized gains and losses are summarized as follows:

(dollars in thousands)
Securities held-to-maturity
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
December 31, 2023
State, county and municipal securities$31,905 $— $(5,051)$26,854 
Mortgage-backed securities109,607 — (13,730)95,877 
Total debt securities held-to-maturity$141,512 $— $(18,781)$122,731 
December 31, 2022
State, county and municipal securities$31,905 $— $(5,380)$26,525 
Mortgage-backed securities102,959 — (14,946)88,013 
Total debt securities held-to-maturity$134,864 $— $(20,326)$114,538 
Schedule of Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity
The amortized cost and estimated fair value of debt securities available-for-sale and held-to-maturity as of December 31, 2023, by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without penalty. Therefore, these securities are not included in the maturity categories in the following maturity summary.

Available-for-SaleHeld-to-Maturity
(dollars in thousands)
Amortized
Cost
Estimated
Fair
Value
Amortized
Cost
Estimated
Fair
Value
Due in one year or less$331,452 $329,133 $— $— 
Due from one year to five years436,955 426,410 — — 
Due from five to ten years9,253 8,764 — — 
Due after ten years48,964 47,149 31,905 26,854 
Mortgage-backed securities621,013 591,488 109,607 95,877 
$1,447,637 $1,402,944 $141,512 $122,731 
Schedule of Gross Unrealized Losses and Fair Value of Securities
The following table shows the gross unrealized losses and estimated fair value of available-for-sale securities aggregated by category and length of time that securities have been in a continuous unrealized loss position at December 31, 2023 and 2022.

Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)
Securities available-for-sale
Estimated
Fair
Value
Unrealized LossesEstimated
Fair
Value		Unrealized LossesEstimated
Fair
Value		Unrealized Losses
December 31, 2023
U.S. Treasuries$159,667 $(827)$537,313 $(10,966)$696,980 $(11,793)
U.S. government-sponsored agencies— — 985 (38)985 (38)
State, county and municipal securities1,923 — 19,754 (944)21,677 (944)
Corporate debt securities500 — 8,527 (850)9,027 (850)
SBA pool securities42 — 21,267 (1,519)21,309 (1,519)
Mortgage-backed securities126 — 566,707 (29,592)566,833 (29,592)
Total debt securities$162,258 $(827)$1,154,553 $(43,909)$1,316,811 $(44,736)
Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)
Securities available-for-sale
Estimated
Fair
Value
Unrealized LossesEstimated
Fair
Value		Unrealized LossesEstimated
Fair
Value		Unrealized Losses
December 31, 2022
U.S. Treasuries$725,250 $(16,381)$— $— $725,250 $(16,381)
U. S. government sponsored agencies979 (57)— — 979 (57)
State, county and municipal securities27,438 (1,180)— — 27,438 (1,180)
Corporate debt securities13,271 (126)1,155 (270)14,426 (396)
SBA pool securities17,806 (1,298)9,329 (729)27,135 (2,027)
Mortgage-backed securities620,544 (37,774)16,847 (1,319)637,391 (39,093)
Total debt securities$1,405,288 $(56,816)$27,331 $(2,318)$1,432,619 $(59,134)
Schedule of Held-to-Maturity Securities with Unrealized Losses
The following table shows the gross unrealized losses and estimated fair value of held-to-maturity securities aggregated by category and length of time that securities have been in a continuous unrealized loss position at December 31, 2023 and 2022:

 Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)
Securities held-to-maturity
Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses
December 31, 2023
State, county and municipal securities$— $— $26,854 $(5,051)$26,854 $(5,051)
Mortgage-backed securities13,612 (227)82,265 (13,503)95,877 (13,730)
Total debt securities held-to-maturity$13,612 $(227)$109,119 $(18,554)$122,731 $(18,781)
December 31, 2022
State, county and municipal securities$16,512 $(1,488)$10,013 $(3,892)$26,525 $(5,380)
Mortgage-backed securities32,471 (1,925)55,542 (13,021)88,013 (14,946)
Total debt securities held-to-maturity$48,983 $(3,413)$65,555 $(16,913)$114,538 $(20,326)
Schedule of Investments Available-for-sale, Allowance for Credit Loss The remaining $44.7 million in unrealized loss was determined to be from factors other than credit, primarily changes in market interest rates.
For the Years Ended December 31,
(dollars in thousands)202320222021
Allowance for credit losses
Beginning balance$75 $— $112 
Current-period provision for expected credit losses(6)75 (112)
Ending balance$69 $75 $— 
Schedule of Gain (Loss) on Investments
Net gain on securities reported on the consolidated statements of income is comprised of the following:
For the Years Ended December 31,
(dollars in thousands)202320222021
Net realized losses on sales of securities available-for-sale$(310)$— $— 
Unrealized holding gains (losses) on equity securities6 (67)(17)
Net realized gains on sales of other investments— 270 532 
Net gain (loss) on securities$(304)$203 $515