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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
The amortized cost and estimated fair values of investment securities are summarized below:

The amortized cost and estimated fair values of investment securities are summarized below:

 
Investment Securities
AVAILABLE-FOR-SALE:      Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
June 30, 2020                    
US Treasury securities  $3,502   $19   $—   $3,521 
Government Sponsored Enterprises   990    23    —    1,013 
Mortgage-backed securities   172,969    7,683    317    180,335 
Small Business Administration pools   39,289    938    11    40,216 
State and local government   64,043    4,794    —    68,837 
Other securities   1,997    —    —    1,997 
   $282,790   $13,457   $328   $295,919 
                     
       Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
December 31, 2019                    
US Treasury securities  $7,190   $16   $3   $7,203 
Government Sponsored Enterprises   984    17    —    1,001 
Mortgage-backed securities   182,736    1,490    640    183,586 
Small Business Administration pools   45,301    259    217    45,343 
State and local government   47,418    2,371    141    49,648 
Other securities   19    —    —    19 
   $283,648   $4,153   $1,001   $286,800 
The following tables show gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous loss position, at June 30, 2020 and December 31, 2019.

The following tables show gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous loss position, at June 30, 2020 and December 31, 2019.

  
Investment Securities (Details 2)
                              
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
June 30, 2020  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
Mortgage-backed securities  $23,967   $264   $3,639   $53   $27,606   $317 
Small Business Administration pools   194    —    5,693    11    5,887    11 
Total  $24,161   $264   $9,332   $64   $33,493   $328 
                              
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
December 31, 2019  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
US Treasury securities  $—   $—   $1,508   $3   $1,508   $3 
Mortgage-backed securities   57,175    485    12,419    155    69,594    640 
Small Business Administration pools   7,891    53    13,502    164    21,393    217 
State and local government   5,695    141    —    —    5,695    141 
Total  $70,761   $679   $27,429   $322   $98,190   $1,001 
The following sets forth the amortized cost and fair value of investment securities at June 30, 2020 by contractual maturity. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay the obligations with or without prepayment penalties. MBSs are based on average life at estimated prepayment speeds.

The following sets forth the amortized cost and fair value of investment securities at June 30, 2020 by contractual maturity. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay the obligations with or without prepayment penalties. MBSs are based on average life at estimated prepayment speeds.

 
Investment Securities (Details 3)
June 30, 2020  Available-for-sale 
   Amortized   Fair 
(Dollars in thousands)  Cost   Value 
Due in one year or less  $12,438   $12,566 
Due after one year through five years   120,737    124,897 
Due after five years through ten years   119,104    126,668 
Due after ten years   30,511    31,788 
Total  $282,790   $295,919