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Note 6 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 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 - June 30, 2022

                               

Equity securities

  $ 6,462     $ -     $ 1,826     $ 8,288  
                                 

Investment Securities, Available for Sale - June 30, 2022

                               

U. S. Treasury notes and bonds

  $ -     $ 83,643     $ -     $ 83,643  

State and municipal

    -       256,661       -       256,661  

Mortgage-backed

    -       211,128       -       211,128  

Corporate

    -       1,238       -       1,238  

Asset-backed securities

    -       13,472       -       13,472  

Total

  $ -     $ 566,142     $ -     $ 566,142  
                                 

Derivative Instruments - June 30, 2022

                               

Interest rate derivative contracts - assets

  $ -     $ 14,209     $ -     $ 14,209  

Interest rate derivative contracts - liabilities

  $ -     $ 2,393     $ -     $ 2,393  
                                 

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]
   

Six Months Ended

 

(Dollars in thousands)

 

June 30,

 
   

2022

   

2021

 

Equity Securities Held at Fair Value

               

Balance, January 1

  $ 1,768     $ 1,485  

Total realized and unrealized gains included in noninterest income

    (5 )     (39 )

Net purchases, sales, calls, and maturities

    63       220  

Net transfers into Level 3

    -       -  

Balance, June 30

  $ 1,826     $ 1,666  
                 

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 June 30

  $ (5 )   $ (39 )
                 

Investment Securities, Available for Sale

               

Balance, January 1

  $ 21,050     $ 11,423  

Total unrealized gains included in other comprehensive income

    -       (264 )

Net purchases, sales, calls, and maturities

    -       1,966  

Net transfers into Level 3

    -       -  

Transfer to held to maturity

    (21,050 )     -  

Balance, June 30

  $ -     $ 13,125  
                 

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 June 30

  $ -     $ (250 )
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, 2022

  $ 2,687     $ -     $ -     $ 2,687  

December 31, 2021

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

Other Real Estate

                               

June 30, 2022

  $ -     $ -     $ -     $ -  

December 31, 2021

  $ 194     $ -     $ -     $ 194  
                                 

Mortgage Loan Servicing Rights

                               

June 30, 2022

  $ 4,679     $ -     $ 4,679     $ -  

December 31, 2021

  $ 4,666     $ -     $ 4,666     $ -