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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Available-For-Sale

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 
September 30, 2021                    
US Treasury securities  $15,729   $—   $346   $15,383 
Government Sponsored Enterprises   2,498    2    —    2,500 
Mortgage-backed securities   364,826    4,630    3,501    365,955 
Small Business Administration pools   32,083    630    57    32,656 
State and local government   85,528    4,722    344    89,906 
Corporate and other securities   7,023    171    94    7,100 
   $507,687   $10,155   $4,342   $513,500 
                     
       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 
Schedule of gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous loss position

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 September 30, 2021 and December 31, 2020.

 
Investment Securities (Details 2)
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
September 30, 2021  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
US Treasury Securities  $15,384   $346   $—   $—   $15,384   $346 
Mortgage-backed securities   215,705    3,316    15,164    185    230,869    3,501 
Small Business Administration pools   7,296    57    —    —    7,296    57 
State and local government   15,992    344    —    —    15,992    344 
Corporate and other securities   2,163    94    —    —    2,163    94 
Total  $256,540   $4,157   $15,164   $185   $271,704   $4,342 
                               
(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 
Schedule of the amortized cost and fair value of investment securities by expected maturity

The following sets forth the amortized cost and fair value of investment securities at September 30, 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 
September 30, 2021  Amortized   Fair 
(Dollars in thousands)  Cost   Value 
Due in one year or less  $23,039   $23,211 
Due after one year through five years   167,304    170,323 
Due after five years through ten years   178,906    182,562 
Due after ten years   138,438    137,404 
Total  $507,687   $513,500