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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2022
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, 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 
December 31, 2021
U.S. government-sponsored agencies$7,084 $— $88 $— $7,172 
State, county and municipal securities45,470 — 2,342 — 47,812 
Corporate debt securities27,897 — 719 (120)28,496 
SBA pool securities44,312 — 958 (69)45,201 
Mortgage-backed securities448,124 — 15,822 (6)463,940 
Total debt securities available-for-sale$572,887 $— $19,929 $(195)$592,621 
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, 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 
December 31, 2021
State, county and municipal securities$8,905 $4 $(198)$8,711 
Mortgage-backed securities70,945 — (1,450)69,495 
Total debt securities held-to-maturity$79,850 $4 $(1,648)$78,206 
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, 2022, 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$51,085 $51,049 $— $— 
Due from one year to five years756,739 739,514 — — 
Due from five to ten years25,450 24,679 — — 
Due after ten years24,723 22,790 31,905 26,525 
Mortgage-backed securities701,008 662,028 102,959 88,013 
$1,559,005 $1,500,060 $134,864 $114,538 
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, 2022 and 2021.

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 $(59,134)
December 31, 2021
Corporate debt securities$— $— $1,380 $(120)$1,380 $(120)
SBA pool securities1,312 (6)2,572 (63)3,884 (69)
Mortgage-backed securities5,514 (6)1 — 5,515 (6)
Total debt securities$6,826 $(12)$3,953 $(183)$10,779 $(195)
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 September 30, 2021:

 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, 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)
December 31, 2021
State, county and municipal securities$3,707 $(198)$— $— $3,707 $(198)
Mortgage-backed securities69,495 (1,450)— — 69,495 (1,450)
Total debt securities held-to-maturity$73,202 $(1,648)$— $— $73,202 $(1,648)
Schedule of Investments Available-for-sale, Allowance for Credit Loss The remaining $59.1 million in unrealized loss was determined to be from factors other than credit, primarily changes in market interest rates.
For the Years Ended December 31,
(dollars in thousands)202220212020
Allowance for credit losses
Beginning balance$— $112 $— 
Current-period provision for expected credit losses75 (112)112 
Ending balance$75 $— $112 
Schedule of Gain (Loss) on Investments
Net gain on securities reported on the consolidated statements of income is comprised of the following:
For the Years Ended December 31,
(dollars in thousands)202220212020
Unrealized holding gains (losses) on equity securities$(67)$(17)$5 
Net realized gains on sales of other investments270 532 — 
Net gain on securities$203 $515 $5