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Note 4 - Securities (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
  

September 30, 2022

 
  

Amortized

Costs

  

Gross

Unrealized

Gains

  

Gross

Unrealized

Losses

  

Fair

Values

 

Available for Sale:

                

U.S. Treasuries

 $991  $-  $59  $932 

U.S. Government agencies and corporations

  391,473   45   56,988   334,530 

States and political subdivisions

  190,361   28   41,229   149,160 

Mortgage-backed securities

  176,045   23   8,824   167,244 

Corporate debt securities

  6,501   -   957   5,544 

Total securities available for sale

 $765,371  $96  $108,057  $657,410 
  

December 31, 2021

 
  

Amortized

Costs

  

Gross

Unrealized

Gains

  

Gross

Unrealized

Losses

  

Fair

Values

 

Available for Sale:

                

U.S. Government agencies and corporations

 $279,934  $2,795  $4,710  $278,019 

States and political subdivisions

  195,365   5,314   2,007   198,672 

Mortgage-backed securities

  204,164   2,323   313   206,174 

Corporate debt securities

  3,004   248   37   3,215 

Total securities available for sale

 $682,467  $10,680  $7,067  $686,080 
Investments Classified by Contractual Maturity Date [Table Text Block]
  

September 30, 2022

 
  

Amortized Cost

  

Fair Value

 

Available for Sale:

        

Due in one year or less

 $1,799  $1,798 

Due after one year through five years

  133,556   124,384 

Due after five years through ten years

  324,861   276,378 

Due after ten years

  305,155   254,850 

Total securities available for sale

 $765,371  $657,410 
Schedule of Temporary Impairment Losses, Investments [Table Text Block]
  

September 30, 2022

 
  

Less Than 12 Months

  

12 Months or More

 
  

Fair
Value

  

Unrealized
Loss

  

Fair
Value

  

Unrealized
Loss

 

U.S. Treasuries

 $932  $59  $-  $- 

U.S. Government agencies and corporations

  207,506   25,296   124,968   31,692 

States and political subdivisions

  100,072   23,747   43,622   17,482 

Mortgage-backed securities

  152,201   7,624   12,802   1,200 

Corporate debt securities

  4,749   749   795   208 

Total temporarily impaired securities

 $465,460  $57,475  $182,187  $50,582 
  

December 31, 2021

 
  

Less Than 12 Months

  

12 Months or More

 
  

Fair
Value

  

Unrealized
Loss

  

Fair
Value

  

Unrealized
Loss

 

U.S. Government agencies and corporations

 $201,650  $3,530  $26,792  $1,180 

States and political subdivisions

  50,659   1,214   20,542   793 

Mortgage-backed securities

  13,139   141   4,665   172 

Corporate debt securities

  966   37   -   - 

Total temporarily impaired securities

 $266,414  $4,922  $51,999  $2,145