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Note 5 - Debt Securities (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

2025:

         

Gross

   

Gross

         
   

Amortized

   

Unrealized

   

Unrealized

   

Estimated

 
   

Cost

   

Gains

   

Losses

   

Fair Value

 
                                 

U.S. government treasuries

  $ 163,946     $ 253     $ (5,532 )   $ 158,667  

U.S. government agencies

    88,726       87       (3,303 )     85,510  

U.S. government mortgage-backed securities

    113,399       51       (9,790 )     103,660  

State and political subdivisions

    249,344       138       (13,844 )     235,638  

Corporate bonds

    64,281       60       (3,114 )     61,227  
    $ 679,696     $ 589     $ (35,583 )   $ 644,702  

2024:

         

Gross

   

Gross

         
   

Amortized

   

Unrealized

   

Unrealized

   

Estimated

 
   

Cost

   

Gains

   

Losses

   

Fair Value

 
                                 

U.S. government treasuries

  $ 176,483     $ 8     $ (8,776 )   $ 167,715  

U.S. government agencies

    88,625       2       (5,194 )     83,433  

U.S. government mortgage-backed securities

    103,964       6       (12,920 )     91,050  

State and political subdivisions

    266,118       35       (20,591 )     245,562  

Corporate bonds

    65,338       7       (4,592 )     60,753  
    $ 700,528     $ 58     $ (52,073 )   $ 648,513  
Investments Classified by Contractual Maturity Date [Table Text Block]
   

Amortized

   

Estimated

 
   

Cost

   

Fair Value

 
                 

Due in one year or less

  $ 94,816     $ 93,398  

Due after one year through five years

    381,451       364,726  

Due after five years through ten years

    87,927       80,857  

Due after ten years

    2,103       2,061  
    $ 566,297     $ 541,042  

U.S. government mortgage-backed securities

    113,399       103,660  

Total

  $ 679,696     $ 644,702  
Schedule of Realized Gain (Loss) [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2025

  

2024

  

2025

  

2024

 

Proceeds from sales of securities available-for-sale

 $-  $-  $-  $2,049 

Gross realized gains on securities available-for-sale

  -   -   -   - 

Gross realized losses on securities available-for-sale

  -   -   -   (165)
Gain (Loss) on Securities [Table Text Block]
   

Less than 12 Months

   

12 Months or More

   

Total

 
   

Estimated

   

Unrealized

   

No. of

   

Estimated

   

Unrealized

   

No. of

   

Estimated

   

Unrealized

 

2025:

 

Fair Value

   

Losses

   

Securities

   

Fair Value

   

Losses

   

Securities

   

Fair Value

   

Losses

 
                                                                 

Securities available-for-sale:

                                                               

U.S. government treasuries

  $ 3,020     $ (7 )     1     $ 126,092     $ (5,525 )     73     $ 129,112     $ (5,532 )

U.S. government agencies

    3,066       (22 )     1       71,156       (3,281 )     64       74,222       (3,303 )

U.S. government mortgage-backed securities

    7,751       (57 )     5       82,612       (9,733 )     150       90,363       (9,790 )

State and political subdivisions

    9,487       (167 )     16       212,559       (13,677 )     412       222,046       (13,844 )

Corporate bonds

    990       (3 )     1       53,977       (3,111 )     67       54,967       (3,114 )
    $ 24,314     $ (256 )     24     $ 546,396     $ (35,327 )     766     $ 570,710     $ (35,583 )
   

Less than 12 Months

   

12 Months or More

   

Total

 
   

Estimated

   

Unrealized

   

No. of

   

Estimated

   

Unrealized

   

No. of

   

Estimated

   

Unrealized

 

2024:

 

Fair Value

   

Losses

   

Securities

   

Fair Value

   

Losses

   

Securities

   

Fair Value

   

Losses

 
                                                                 

Securities available-for-sale:

                                                               

U.S. government treasuries

  $ 5,466     $ (43 )     2     $ 159,321     $ (8,733 )     94     $ 164,787     $ (8,776 )

U.S. government agencies

    3,953       (34 )     2       77,166       (5,160 )     70       81,119       (5,194 )

U.S. government mortgage-backed securities

    3,740       (64 )     5       86,870       (12,856 )     154       90,610       (12,920 )

State and political subdivisions

    13,944       (253 )     25       226,201       (20,338 )     440       240,145       (20,591 )

Corporate bonds

    3,153       (27 )     4       56,604       (4,565 )     74       59,757       (4,592 )
    $ 30,256     $ (421 )     38     $ 606,162     $ (51,652 )     832     $ 636,418     $ (52,073 )