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Note 6 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   

Quoted Prices

                         
   

In Active

   

Significant

                 
   

Markets for

   

Other

   

Significant

         
   

Identical

   

Observable

   

Unobservable

   

Balance

 

(Dollars in thousands)

 

Assets

   

Inputs

   

Inputs

   

at Date

 
   

(Level 1)

   

(Level 2)

   

(Level 3)

   

Indicated

 

Equity Securities Held at Fair Value - June 30, 2021

                               

Equity securities

  $ 6,739     $ -     $ 1,666     $ 8,405  
                                 

Investment Securities, Available for Sale - June 30, 2021

                               

U. S. Government and federal agency

  $ -     $ 2,030     $ -     $ 2,030  

U. S. Treasury notes and bonds

    -       37,361       -       37,361  

State and municipal

    -       475,316       12,125       487,441  

Mortgage-backed

    -       318,313       -       318,313  

Corporate

    -       7,342       1,000       8,342  

Asset-backed securities

    -       2,068       -       2,068  

Total

  $ -     $ 842,430     $ 13,125     $ 855,555  
                                 

Equity Securities Held at Fair Value - December 31, 2020

                               

Equity securities

  $ 1,411     $ -     $ 1,485     $ 2,896  
                                 

Investment Securities, Available for Sale - December 31, 2020

                               

U. S. Government and federal agency

  $ -     $ 2,051     $ -     $ 2,051  

U. S. Treasury notes and bonds

    -       2,056       -       2,056  

State and municipal

    -       309,945       10,423       320,368  

Mortgage-backed

    -       246,723       -       246,723  

Corporate

    -       2,589       1,000       3,589  

Total

  $ -     $ 563,364     $ 11,423     $ 574,787  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Six Months Ended

 

(Dollars in thousands)

 

June 30,

 
   

2021

   

2020

 

Equity Securities Held at Fair Value

               

Balance, January 1

  $ 1,485     $ 1,472  

Total realized and unrealized gains included in noninterest income

    (39 )     8  

Net purchases, sales, calls, and maturities

    220       -  

Net transfers into Level 3

    -       -  

Balance, June 30

  $ 1,666     $ 1,480  
                 

Investment Securities, Available for Sale

               

Balance, January 1

  $ 11,423     $ 12,367  

Total unrealized gains included in other comprehensive income

    (264 )     444  

Net purchases, sales, calls, and maturities

    1,966       (666 )

Net transfers into Level 3

    -       -  

Balance, June 30

  $ 13,125     $ 12,145  
Fair Value Measurements, Nonrecurring [Table Text Block]
           

Quoted Prices

                 
           

In Active

   

Significant

         
           

Markets for

   

Other

   

Significant

 
   

Balances at

   

Identical

   

Observable

   

Unobservable

 

(Dollars in thousands)

 

Dates

   

Assets

   

Inputs

   

Inputs

 
   

Indicated

   

(Level 1)

   

(Level 2)

   

(Level 3)

 

Impaired Loans

                               

June 30, 2021

  $ 6,824     $ -     $ -     $ 6,824  

December 31, 2020

  $ 7,851     $ -     $ -     $ 7,851  
                                 

Other Real Estate

                               

June 30, 2021

  $ 260     $ -     $ -     $ 260  

December 31, 2020

  $ 266     $ -     $ -     $ 266  
                                 

Mortgage Loan Servicing Rights

                               

June 30, 2021

  $ 4,461     $ -     $ -     $ 4,461  

December 31, 2020

  $ 3,967     $ -     $ -     $ 3,967