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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2021
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 allowance for credit losses, 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
September 30, 2021
U.S. government sponsored agencies$12,102 $— $150 $— $12,252 
State, county and municipal securities51,541 — 2,675 — 54,216 
Corporate debt securities33,397 — 722 (121)33,998 
SBA pool securities46,354 — 1,629 (66)47,917 
Mortgage-backed securities513,408 — 22,718 (5)536,121 
Total debt securities available-for-sale$656,802 $— $27,894 $(192)$684,504 
December 31, 2020
U.S. government sponsored agencies$17,161 $— $343 $— $17,504 
State, county and municipal securities63,286 — 3,492 — 66,778 
Corporate debt securities51,639 (112)602 (233)51,896 
SBA pool securities59,973 — 2,620 (96)62,497 
Mortgage-backed securities748,521 — 35,797 (114)784,204 
Total debt securities available-for-sale$940,580 $(112)$42,854 $(443)$982,879 
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
September 30, 2021
State, county and municipal securities$3,905 $— $(121)$3,784 
Mortgage-backed securities60,546 — (1,026)59,520 
Total debt securities held-to-maturity$64,451 $— $(1,147)$63,304 
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 September 30, 2021, 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$17,228 $17,357 $— $— 
Due from one year to five years34,212 35,780 — — 
Due from five to ten years52,456 54,242 — — 
Due after ten years39,498 41,004 3,905 3,784 
Mortgage-backed securities513,408 536,121 60,546 59,520 
 $656,802 $684,504 $64,451 $63,304 
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 September 30, 2021 and December 31, 2020:

 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
September 30, 2021      
Corporate debt securities$— $— $1,380 $(121)$1,380 $(121)
SBA pool securities— — 2,754 (66)2,754 (66)
Mortgage-backed securities3,034 (5)137 — 3,171 (5)
Total debt securities available-for-sale$3,034 $(5)$4,271 $(187)$7,305 $(192)
December 31, 2020      
Corporate debt securities$10,159 $(233)$— $— $10,159 $(233)
SBA pool securities— — 3,948 (96)3,948 (96)
Mortgage-backed securities24,120 (114)2 — 24,122 (114)
Total debt securities available-for-sale$34,279 $(347)$3,950 $(96)$38,229 $(443)
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
September 30, 2021
State, county and municipal securities$3,784 $(121)$— $— $3,784 $(121)
Mortgage-backed securities59,520 (1,026)— — 59,520 (1,026)
Total debt securities held-to-maturity$63,304 $(1,147)$— $— $63,304 $(1,147)
Schedule of Investments Available-for-sale, Allowance for Credit Loss The $192,000 in unrealized loss was determined to be from factors other than credit.
(dollars in thousands)Three Months Ended September 30,Nine Months Ended September 30,
Allowance for credit losses
2021202020212020
Beginning balance$81 $— $112 $— 
Provision for expected credit losses(81)68 (112)68 
Ending balance$— $68 $— $68 
Schedule of Gain (Loss) on Investments
Total net gain on securities reported on the consolidated statements of income and comprehensive income is comprised of the following for the three and nine months ended September 30, 2021 and 2020:

Three Months Ended September 30,Nine Months Ended September 30,
(dollars in thousands)2021202020212020
Unrealized holding gains (losses) on equity securities$(2)$— $(13)$5 
Net realized gains on sales of other investments532 — 532 — 
Total gain on securities$530 $— $519 $5