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Note 4 - Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
                  

Allowance

 
                  

for

 
      

Gross

  

Gross

      

Investment

 
  

Amortized

  

Unrealized

  

Unrealized

  

Fair

  

Credit

 
  

Cost

  

Gains

  

Losses

  

Value

  

Losses

 
  

(dollars in thousands)

 

September 30, 2024

                    

Investment securities available-for-sale:

                    

Federal agency obligations

 $100,284  $596  $(10,070) $90,810  $- 

Residential mortgage pass-through securities

  441,794   937   (43,496)  399,235   - 

Commercial mortgage pass-through securities

  25,053   -   (2,768)  22,285   - 

Obligations of U.S. states and political subdivisions

  143,547   422   (15,662)  128,307   - 

Corporate bonds and notes

  5,000   11   -   5,011   - 

Asset-backed securities

  917   -   (11)  906   - 

Other securities

  159   -   -   159   - 

Total investment securities available-for-sale

 $716,754  $1,966  $(72,007) $646,713  $- 
                     

December 31, 2023

                    

Investment securities available-for-sale:

                    

Federal agency obligations

 $55,898  $189  $(10,761) $45,326  $- 

Residential mortgage pass-through securities

  462,004   620   (51,433)  411,191   - 

Commercial mortgage pass-through securities

  25,240   -   (3,676)  21,564   - 

Obligations of U.S. states and political subdivisions

  148,795   415   (16,505)  132,705   - 

Corporate bonds and notes

  5,000   -   (27)  4,973   - 

Asset-backed securities

  1,260   -   (22)  1,238   - 

Other securities

  165   -   -   165   - 

Total investment securities available-for-sale

 $698,362  $1,224  $(82,424) $617,162  $- 
Investments Classified by Contractual Maturity Date [Table Text Block]
  

September 30, 2024

 
  

Amortized

  

Fair

 
  

Cost

  

Value

 
  

(dollars in thousands)

 

Investment securities available-for-sale:

        

Due in one year or less

 $1,284  $1,285 

Due after one year through five years

  8,048   8,092 

Due after five years through ten years

  10,446   9,522 

Due after ten years

  229,970   206,135 

Residential mortgage pass-through securities

  441,794   399,235 

Commercial mortgage pass-through securities

  25,053   22,285 

Other securities

  159   159 

Total investment securities available-for-sale

 $716,754  $646,713 
Unrealized Gain (Loss) on Investments [Table Text Block]
  

September 30, 2024

 
  

Total

  

Less than 12 Months

  

12 Months or Longer

 
  

Fair

  

Unrealized

  

Fair

  

Unrealized

  

Fair

  

Unrealized

 
  

Value

  

Losses

  

Value

  

Losses

  

Value

  

Losses

 
  

(dollars in thousands)

 

Investment securities available-for-sale:

                        

Federal agency obligations

 $37,857  $(10,070) $-  $-  $37,857  $(10,070)

Residential mortgage pass-through securities

  369,309   (43,496)  5,786   (110)  363,523   (43,386)

Commercial mortgage pass-through securities

  22,285   (2,768)  -   -   22,285   (2,768)

Obligations of U.S. states and political subdivisions

  104,497   (15,662)  7,682   (42)  96,815   (15,620)

Corporate bonds and notes

  -   -   -   -   -   - 

Asset-backed securities

  906   (11)  -   -   906   (11)

Total temporarily impaired securities

 $534,854  $(72,007) $13,468  $(152) $521,386  $(71,855)
  

December 31, 2023

 
  

Total

  

Less than 12 Months

  

12 Months or Longer

 
  

Fair

  

Unrealized

  

Fair

  

Unrealized

  

Fair

  

Unrealized

 
  

Value

  

Losses

  

Value

  

Losses

  

Value

  

Losses

 
  

(dollars in thousands)

 

Investment securities available-for-sale:

                        

Federal agency obligations

 $40,779  $(10,761) $1,689  $(65) $39,090  $(10,696)

Residential mortgage pass-through securities

  382,042   (51,433)  4,138   (51)  377,904   (51,382)

Commercial mortgage pass-through securities

  21,565   (3,676)  -   -   21,565   (3,676)

Obligations of U.S. states and political subdivisions

  101,189   (16,505)  1,340   (7)  99,849   (16,498)

Corporate bonds and notes

  4,973   (27)  2,993   (7)  1,980   (20)

Asset-backed securities

  1,238   (22)  -   -   1,238   (22)

Total temporarily impaired securities

 $551,786  $(82,424) $10,160  $(130) $541,626  $(82,294)