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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2021
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
March 31, 2021
U.S. government sponsored agencies$12,138 $— $256 $— $12,394 
State, county and municipal securities60,140 — 2,845 — 62,985 
Corporate debt securities46,131 (101)946 (229)46,747 
SBA pool securities54,305 — 1,488 (102)55,691 
Mortgage-backed securities654,015 — 27,851 (31)681,835 
Total debt securities$826,729 $(101)$33,386 $(362)$859,652 
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$940,580 $(112)$42,854 $(443)$982,879 
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 March 31, 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:
(dollars in thousands)
Amortized
Cost		Estimated Fair Value
Due in one year or less$20,247 $20,462 
Due from one year to five years48,460 50,244 
Due from five to ten years59,558 61,722 
Due after ten years44,449 45,389 
Mortgage-backed securities654,015 681,835 
 $826,729 $859,652 
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 March 31, 2021 and December 31, 2020:
 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
March 31, 2021      
Corporate debt securities$2,920 $(229)$— $— $2,920 $(229)
SBA pool securities1,755 (13)3,798 (89)5,553 (102)
Mortgage-backed securities10,102 (28)374 (3)10,476 (31)
Total debt securities$14,777 $(270)$4,172 $(92)$18,949 $(362)
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$34,279 $(347)$3,950 $(96)$38,229 $(443)
Schedule of Investments Available-for-sale, Allowance for Credit Loss The remaining $362,000 in unrealized loss was determined to be from factors other than credit.
(dollars in thousands)
Allowance for credit losses
Three Months Ended
March 31, 2021		Three Months Ended
March 31, 2020
Beginning balance$112 $— 
Provision for expected credit losses(11)— 
Ending balance$101 $— 
Gain on Investments
Total loss on securities reported on the consolidated statements of income and comprehensive income is comprised of the following for the three months ended March 31, 2021 and 2020:
(dollars in thousands)March 31, 2021March 31, 2020
Unrealized holding losses on equity securities$(12)$(9)
Total loss on securities$(12)$(9)