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Note 6 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2022
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 - March 31, 2022

                               

Equity securities

  $ 6,515     $ -     $ 1,767     $ 8,282  
                                 

Investment Securities, Available for Sale - March 31, 2022

                               

U. S. Government and federal agency

  $ -     $ -     $ -     $ -  

U. S. Treasury notes and bonds

    -       86,491       -       86,491  

State and municipal

    -       312,388       -       312,388  

Mortgage-backed

    -       226,669       -       226,669  

Corporate

    -       1,255       -       1,255  

Asset-backed securities

    -       14,245       -       14,245  

Total

  $ -     $ 641,048     $ -     $ 641,048  
                                 

Equity Securities Held at Fair Value - December 31, 2021

                               

Equity securities

  $ 6,724     $ -     $ 1,768     $ 8,492  
                                 

Investment Securities, Available for Sale - December 31, 2021

                               

U. S. Government and federal agency

  $ -     $ 2,008     $ -     $ 2,008  

U. S. Treasury notes and bonds

    -       91,979       -       91,979  

State and municipal

    -       514,797       20,050       534,847  

Mortgage-backed

    -       433,115       -       433,115  

Corporate

    -       19,642       1,000       20,642  

Asset-backed securities

    -       16,294       -       16,294  

Total

  $ -     $ 1,077,835     $ 21,050     $ 1,098,885  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Three Months Ended

 

(Dollars in thousands)

 

March 31,

 
   

2022

   

2021

 

Equity Securities Held at Fair Value

               

Balance, January 1

  $ 1,768     $ 1,485  

Total realized and unrealized gains included in noninterest income

    (1 )     (40 )

Net purchases, sales, calls, and maturities

    -       500  

Net transfers into Level 3

    -       -  

Balance, March 31

  $ 1,767     $ 1,945  
                 

Amount of total losses for the period included in earning attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at March 31

  $ (1 )   $ (40 )
                 

Investment Securities, Available for Sale

               

Balance, January 1

  $ 21,050     $ 11,423  

Total unrealized gains included in other comprehensive income

    -       (270 )

Net purchases, sales, calls, and maturities

    -       2,453  

Net transfers into Level 3

    -       -  

Transfer to held to maturity

    (21,050 )     -  

Balance, March 31

  $ -     $ 13,606  
                 

Amount of total losses for the period included in earning attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at March 31

  $ -     $ (270 )
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

                               

March 31, 2022

  $ 4,940     $ -     $ -     $ 4,940  

December 31, 2021

  $ 5,433     $ -     $ -     $ 5,433  
                                 

Other Real Estate

                               

March 31, 2022

  $ 172     $ -     $ -     $ 172  

December 31, 2021

  $ 194     $ -     $ -     $ 194  
                                 

Mortgage Loan Servicing Rights

                               

March 31, 2022

  $ 4,680     $ -     $ 4,680     $ -  

December 31, 2021

  $ 4,666     $ -     $ 4,666     $ -