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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale
The amortized cost and estimated fair value of securities available-for-sale along with gross unrealized gains and losses are summarized as follows:

(dollars in thousands)
Securities available-for-sale
Amortized
Cost		Allowance for Credit LossesGross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
June 30, 2022
U.S. Treasuries$314,613 $— $— $(1,724)$312,889 
U.S. government-sponsored agencies2,050 — — (29)2,021 
State, county and municipal securities41,428 — 261 (726)40,963 
Corporate debt securities15,897 (88)2 (348)15,463 
SBA pool securities35,854 — 6 (1,429)34,431 
Mortgage-backed securities658,508 — 420 (12,427)646,501 
Total debt securities available-for-sale$1,068,350 $(88)$689 $(16,683)$1,052,268 
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 
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
June 30, 2022
State, county and municipal securities$31,905 $— $(4,279)$27,626 
Mortgage-backed securities79,749 — (10,231)69,518 
Total debt securities held-to-maturity$111,654 $— $(14,510)$97,144 
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 
Amortized Cost and Estimated Fair Value of Debt Securities, Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities available-for-sale and held-to-maturity as of June 30, 2022, by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying these 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 ValueAmortized
Cost		Estimated Fair Value
Due in one year or less$6,745 $6,754 $— $— 
Due from one year to five years339,429 337,279 — — 
Due from five to ten years31,462 31,085 — — 
Due after ten years32,206 30,649 31,905 27,626 
Mortgage-backed securities658,508 646,501 79,749 69,518 
 $1,068,350 $1,052,268 $111,654 $97,144 
Schedule of Available-for-Sale Securities with Unrealized Losses
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 June 30, 2022 and December 31, 2021:

 Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)
Securities available-for-sale
Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses
June 30, 2022      
U.S. Treasuries$312,889 $(1,724)$— $— $312,889 $(1,724)
U.S. government-sponsored agencies2,021 (29)— — 2,021 (29)
State, county and municipal securities15,199 (726)— — 15,199 (726)
Corporate debt securities12,244 (256)1,320 (92)13,564 (348)
SBA pool securities31,755 (1,379)2,310 (50)34,065 (1,429)
Mortgage-backed securities569,386 (12,427)1 — 569,387 (12,427)
Total debt securities available-for-sale$943,494 $(16,541)$3,631 $(142)$947,125 $(16,683)
December 31, 2021      
Corporate debt securities$— $— $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 available-for-sale$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 June 30, 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
June 30, 2022
State, county and municipal securities$27,626 $(4,279)$— $— $27,626 $(4,279)
Mortgage-backed securities69,518 (10,231)— — 69,518 (10,231)
Total debt securities held-to-maturity$97,144 $(14,510)$— $— $97,144 $(14,510)
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 $16.7 million in unrealized loss was determined to be from factors other than credit.
(dollars in thousands)Three Months Ended June 30,Six Months Ended June 30,
Allowance for credit losses
2022202120222021
Beginning balance$— $101 $— $112 
Provision for expected credit losses88 (20)88 (31)
Ending balance$88 $81 $88 $81 
Schedule of Gain (Loss) on Investments
Total net gain (loss) on securities reported on the consolidated statements of income and comprehensive income is comprised of the following for the three and six months ended June 30, 2022 and 2021:

Three Months Ended June 30,Six Months Ended June 30,
(dollars in thousands)2022202120222021
Unrealized holding gains (losses) on equity securities$(22)$1 $(49)$(11)
Net realized gains on sales of other investments270 — 270 — 
Net gain (loss) on securities$248 $1 $221 $(11)