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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
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 
March 31, 2022                    
US Treasury securities  $60,406   $—   $1,811   $58,595 
Government Sponsored Enterprises   2,499    —    182    2,317 
Mortgage-backed securities   391,271    217    13,140    378,348 
Small Business Administration pools   28,112    209    337    27,984 
State and local government   105,757    1,182    4,968    101,971 
Corporate and other securities   8,774    81    250    8,605 
Total  $596,819   $1,689   $20,688   $577,820 
                     
       Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
December 31, 2021                    
US Treasury securities  $15,736   $—   $300   $15,436 
Government Sponsored Enterprises   2,499    2    —    2,501 
Mortgage-backed securities   398,125    3,596    3,992    397,729 
Small Business Administration pools   30,835    505    67    31,273 
State and local government   105,469    4,918    539    109,848 
Corporate and other securities   8,024    157    129    8,052 
Total  $560,688   $9,178   $5,027   $564,839 
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 March 31, 2022 and December 31, 2021.

 
Investment Securities (Details 2)
                         
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
March 31, 2022  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
US Treasury Securities  $53,261   $1,271   $5,334   $540   $58,595   $1,811 
Government Sponsored Enterprise   2,317    182    —    —    2,317    182 
Mortgage-backed securities   261,976    8,929    86,207    4,211    348,183    13,140 
Small Business Administration pools   12,529    295    2,642    42    15,171    337 
State and local government   59,077    4,392    2,961    576    62,038    4,968 
Corporate and other securities   4,507    250    —    —    4,507    250 
Total  $393,667   $15,319   $97,144   $5,369   $490,811   $20,688 
             
(Dollars in thousands)  Less than 12 months   12 months or more   Total 
December 31, 2021  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
Available-for-sale securities:  Value   Loss   Value   Loss   Value   Loss 
                         
US Treasury Securities  $ 14,479   $ 264   $ 958   $36   $15,437   $300 
Mortgage-backed securities   200,238    3,156    48,570    836    248,808    3,992 
Small Business Administration pools   7,232    67    —    —    7,232    67 
State and local government   21,261    539    —    —    21,261    539 
Corporate and other securities   3,621    129    —    —    3,621    129 
Total  $246,831   $4,155   $49,528   $872   $296,359   $5,027 
Schedule of Amortized Cost and Fair Value of Investment Securities

The following sets forth the amortized cost and fair value of investment securities at March 31, 2022 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, 2022  Amortized   Fair 
(Dollars in thousands)  Cost   Value 
Due in one year or less  $20,273   $20,132 
Due after one year through five years   211,536    207,996 
Due after five years through ten years   285,494    272,064 
Due after ten years   79,516    77,658 
Total  $596,819   $577,820