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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2019
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 gross unrealized gains and losses are summarized as follows:
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized Losses
Estimated
Fair
Value
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  
December 31, 2018
State, county and municipal securities$149,670  $1,367  $(304) $150,733  
Corporate debt securities67,123  718  (527) 67,314  
SBA pool securities79,410  183  (1,789) 77,804  
Mortgage-backed securities902,773  3,989  (10,190) 896,572  
Total debt securities$1,198,976  $6,257  $(12,810) $1,192,423  
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 December 31, 2019 and 2018.
Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)
Estimated
Fair
Value
Unrealized LossesEstimated
Fair
Value		Unrealized LossesEstimated
Fair
Value		Unrealized Losses
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) 
December 31, 2018
State, county and municipal securities$23,784  $(52) $33,873  $(252) $57,657  $(304) 
Corporate debt securities17,291  (111) 17,952  (416) 35,243  (527) 
SBA pool securities1,291  (7) 61,966  (1,782) 63,257  (1,789) 
Mortgage-backed securities118,454  (573) 373,783  (9,617) 492,237  (10,190) 
Total debt securities$160,820  $(743) $487,574  $(12,067) $648,394  $(12,810) 
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 as of December 31, 2019, 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. Securities not due at a single maturity date are shown separately. 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$29,116  $29,298  
Due from one year to five years62,121  63,030  
Due from five to ten years91,717  93,822  
Due after ten years67,668  68,383  
Mortgage-backed securities1,129,816  1,148,870  
$1,380,438  $1,403,403  
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 Years Ended December 31,
(dollars in thousands)201920182017
Gross gains on sales of securities$522  $390  $38  
Gross losses on sales of securities(464) (301) (1) 
Net realized gains on sales of securities available for sale$58  $89  $37  
Sales proceeds$64,995  $68,727  $3,090  
Gain (Loss) on Securities
Total gain (loss) on securities reported on the consolidated statements of income is comprised of the following:
For the Years Ended December 31,
(dollars in thousands)201920182017
Net realized gains on sales of securities available for sale$58  $89  $37  
Unrealized holding gains (losses) on equity securities19  (126) —  
Net realized gains on sales of other investments61  —  —  
Total gain (loss) on securities$138  $(37) $37