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Note 3 - Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]

(dollars in thousands)

  

Amortized Cost

    

Gross

Unrealized

Gains

    

Gross Unrealized Losses

    

Fair Value

  

Available-for-sale securities:

                                

U.S. agencies

   $ 96,862     $ 226     $ (3,106 )   $ 93,982  

Collateralized mortgage obligations

     26,388       65       (355 )     26,098  

Municipalities

     322,063       1,671       (17,522 )     306,212  

SBA pools

     940       1       (1 )     940  

Corporate debt

     43,500       10       (2,477 )     41,033  

Asset backed securities

     49,637       59       (629 )     49,067  
    $ 539,390     $ 2,032     $ (24,090 )   $ 517,332  

(dollars in thousands)

  

Amortized Cost

    

Gross

Unrealized

Gains

    

Gross

Unrealized

Losses

    

Fair Value

  

Available-for-sale securities:

                                

U.S. agencies

   $ 84,678     $ 11     $ (4,430 )   $ 80,259  

Collateralized mortgage obligations

     9,108       0       (444 )     8,664  

Municipalities

     345,981       2,792       (19,865 )     328,908  

SBA pools

     1,394       3       (2 )     1,395  

Corporate debt

     47,500       9       (3,992 )     43,517  

Asset backed securities

     56,613       133       (1,411 )     55,335  
    $ 545,274     $ 2,948     $ (30,144 )   $ 518,078  
Gain (Loss) on Securities [Table Text Block]

(dollars in thousands)

          

Less than 12 months

    

12 months or more

    

Total

  

Description of Securities

  

Number

of

Securities

   

Fair

Value

    

Unrealized Loss

    

Fair

Value

    

Unrealized Loss

    

Fair

Value

    

Unrealized Loss

  

U.S. agencies

     37     $ 4,966     $ (119 )   $ 57,899     $ (2,987 )   $ 62,865     $ (3,106 )

Collateralized mortgage obligations

     6       8,286       (7 )     3,568       (348 )     11,854       (355 )

Municipalities

     93       28,246       (139 )     183,696       (17,383 )     211,942       (17,522 )

SBA pools

     3       128       0       160       (1 )     288       (1 )

Corporate debt

     11       0       0       39,023       (2,477 )     39,023       (2,477 )

Asset backed securities

     14       8,143       (21 )     17,625       (608 )     25,768       (629 )

Total temporarily impaired securities

     164     $ 49,769     $ (286 )   $ 301,971     $ (23,804 )   $ 351,740     $ (24,090 )

(dollars in thousands)

          

Less than 12 months

    

12 months or more

    

Total

  

Description of Securities

  

Number

of

Securities

   

Fair Value

    

Unrealized Loss

    

Fair Value

    

Unrealized Loss

    

Fair Value

    

Unrealized Loss

  

U.S. agencies

     51     $ 190     $ (3 )   $ 79,556     $ (4,427 )   $ 79,746     $ (4,430 )

Collateralized mortgage obligations

     6       4,791       (1 )     3,873       (443 )     8,664       (444 )

Municipalities

     106       44,859       (453 )     178,812       (19,412 )     223,671       (19,865 )

SBA pools

     4       116       0       472       (2 )     588       (2 )

Corporate debt

     13       0       0       41,508       (3,992 )     41,508       (3,992 )

Asset backed securities

     19       2,123       (8 )     32,535       (1,403 )     34,658       (1,411 )

Total temporarily impaired securities

     199     $ 52,079     $ (465 )   $ 336,756     $ (29,679 )   $ 388,835     $ (30,144 )
Investments Classified by Contractual Maturity Date [Table Text Block]

(dollars in thousands)

  

Amortized

    

Fair

  
   

Cost

    

Value

  

Available-for-sale securities:

                

Due in one year or less

   $ 89,461     $ 86,651  

Due after one year through five years

     155,826       153,114  

Due after five years through ten years

     185,793       172,544  

Due after ten years

     108,310       105,023  
    $ 539,390     $ 517,332