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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
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)Amortized
Cost		Allowance for Credit LossesGross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
September 30, 2020
U.S. government sponsored agencies$17,184 $— $420 $— $17,604 
State, county and municipal securities84,219 — 3,429 — 87,648 
Corporate debt securities51,659 (68)826 (276)52,141 
SBA pool securities62,204 — 3,019 (107)65,116 
Mortgage-backed securities855,083 — 39,942 (98)894,927 
Total debt securities$1,070,349 $(68)$47,636 $(481)$1,117,436 
December 31, 2019
U.S. government sponsored agencies$22,246 $— $116 $— $22,362 
State, county and municipal securities102,952 — 2,310 (2)105,260 
Corporate debt securities51,720 — 1,281 (2)52,999 
SBA pool securities73,704 — 617 (409)73,912 
Mortgage-backed securities1,129,816 — 19,937 (883)1,148,870 
Total debt securities$1,380,438 $— $24,261 $(1,296)$1,403,403 
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 securities as of September 30, 2020, 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:
(dollars in thousands)
Amortized
Cost		Estimated
Fair
Value
Due in one year or less$35,577 $35,851 
Due from one year to five years56,870 58,892 
Due from five to ten years68,527 71,211 
Due after ten years54,292 56,555 
Mortgage-backed securities855,083 894,927 
 $1,070,349 $1,117,436 
Schedule of Gross Unrealized Losses and Fair Value of Securities
The following table shows the gross unrealized losses and estimated fair value of securities aggregated by category and length of time that securities have been in a continuous unrealized loss position at September 30, 2020 and December 31, 2019.
 Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses
September 30, 2020      
Corporate debt securities$9,906 $(276)$— $— $9,906 $(276)
SBA pool securities— — 4,276 (107)4,276 (107)
Mortgage-backed securities24,687 (98)2 — 24,689 (98)
Total debt securities$34,593 $(374)$4,278 $(107)$38,871 $(481)
December 31, 2019      
State, county and municipal securities$803 $(2)$— $— $803 $(2)
Corporate debt securities2,573 (2)— — 2,573 (2)
SBA pool securities28,521 (285)4,825 (124)33,346 (409)
Mortgage-backed securities99,279 (416)52,326 (467)151,605 (883)
Total debt securities$131,176 $(705)$57,151 $(591)$188,327 $(1,296)
Schedule of Investments Available-for-sale, Allowance for Credit Loss The remaining $481,000 in unrealized loss was determined to be from factors other than credit.
(dollars in thousands)Nine Months Ended
September 30, 2020
Allowance for credit losses
Beginning balance$— 
Current-period provision for expected credit losses68 
Ending balance$68 
Gross Realized Gains and Losses on Sales of Available for Sale Securities
The following table is a summary of sales activities in the Company’s investment securities available for sale for the nine months ended September 30, 2020 and 2019:
(dollars in thousands)September 30, 2020September 30, 2019
Gross gains on sales of securities$— $522 
Gross losses on sales of securities— (464)
Net realized gains on sales of securities available for sale$— $58 
Sales proceeds$— $64,995 
Gain on Investments
Total gain on securities reported on the consolidated statements of income and comprehensive income is comprised of the following for the nine months ended September 30, 2020 and 2019:
(dollars in thousands)September 30, 2020September 30, 2019
Net realized gains on sales of securities available for sale$— $58 
Unrealized holding gains on equity securities5 19 
Net realized gains on sales of other investments— 62 
Total gain on securities$5 $139