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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2021
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:

 

AVAILABLE-FOR-SALE:

 
Investment Securities
       Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
March 31, 2021                    
US Treasury securities  $15,715   $—   $704   $15,011 
Government Sponsored Enterprises   999    3    —    1,002 
Mortgage-backed securities   257,874    4,899    1,867    260,906 
Small Business Administration pools   37,115    685    18    37,782 
State and local government   84,383    4,554    1,116    87,821 
Corporate and other securities   3,274    52    —    3,326 
   $399,360   $10,193   $3,705   $405,848 
                     
       Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
December 31, 2020                    
US Treasury securities   $ 1,501     $ 1     $ —     $ 1,502  
Government Sponsored Enterprises     996       10       —       1,006  
Mortgage-backed securities     222,739       7,375       185       229,929  
Small Business Administration pools     34,577       928       7       35,498  
State and local government     82,495       6,184       76       88,603  
Corporate and other securities     3,272       56       —       3,328  
    $ 345,580     $ 14,554     $ 268     $ 359,866  
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 March 31, 2021 and December 31, 2020.

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 March 31, 2021 and December 31, 2020.

 
Investment Securities (Details 2)
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
March 31, 2021  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
US Treasury Securities  $15,011   $704   $—   $—   $15,011   $704 
Mortgage-backed securities   99,435    1,842    1,374    25    100,809    1,867 
Small Business Administration pools   486    2    1,299    16    1,785    18 
State and local government   21,854    1,116    —    —    21,854    1,116 
Total  $136,786   $3,664   $2,673   $41   $139,459   $3,705 
                               
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
December 31, 2020  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
Mortgage-backed securities   21,298    152    1,414    33    22,712    185 
Small Business Administration pools   —    —    1,323    7    1,323    7 
State and local government   4,930    76    —    —    4,930    76 
Total  $26,228   $228   $2,737   $40   $28,965   $268 
The following sets forth the amortized cost and fair value of investment securities at March 31, 2021 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 March 31, 2021 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)
   Available-for-sale 
March 31, 2021  Amortized   Fair 
(Dollars in thousands)  Cost   Value 
Due in one year or less  $12,508   $12,728 
Due after one year through five years   138,484    142,260 
Due after five years through ten years   180,804    183,025 
Due after ten years   67,564    67,835 
Total  $399,360   $405,848