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Note 8 - Fair Values of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
      

Quoted Prices in

  

Significant Other

  

Significant

 
      Active Markets for  Observable  Unobservable 
  

Estimated

  

Identical Assets

  

Inputs

  

Inputs

 
  

Fair Value

  

(Level 1)

  

(Level 2)

  

(Level 3)

 

March 31, 2021

                

Assets:

                

Obligations of U.S. government agencies and corporations

 $38,336  $—  $38,336  $— 

Obligations of state and political subdivisions

  22,711   —   4,762   17,949 

Corporate bonds

  29,508   —   29,508   — 

Residential mortgage-backed securities

  139,366   —   139,366   — 

Commercial mortgage-backed securities

  71,512   —   71,512   — 

Equity securities

  1,800   1,800   —   — 

Derivative financial instruments

  5,461   —   5,461   — 

Total assets

 $308,694  $1,800  $288,945  $17,949 
                 

December 31, 2020

                

Assets:

                

Obligations of U.S. government agencies and corporations

 $36,821  $—  $36,821  $— 

Obligations of state and political subdivisions

  22,137   —   3,621   18,516 

Corporate bonds

  27,708   —   27,708   — 

Residential mortgage-backed securities

  122,598   —   122,598   — 

Commercial mortgage-backed securities

  59,146   —   59,146   — 

Equity securities

  1,670   1,670   —   — 

Total assets

 $270,080  $1,670  $249,894  $18,516 
Liabilities:                

Derivative financial instruments

 $2,216  $—  $2,216  $— 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Obligations of State and

 
  

Political Subdivisions

 

Balance at December 31, 2020

 $18,516 

Realized gains (losses) included in earnings

  — 

Unrealized losses included in other comprehensive income (loss)

  (567)

Purchases

  — 

Sales

  — 

Maturities, prepayments, and calls

  — 

Transfers into level 3

  — 

Transfers out of level 3

  — 

Balance at March 31, 2021

 $17,949 
  

Obligations of State and

 
  

Political Subdivisions

 

Balance at December 31, 2019

 $19,375 

Realized gains (losses) included in earnings

  — 

Unrealized losses included in other comprehensive income (loss)

  (2,502)

Purchases

  — 

Sales

  — 

Maturities, prepayments, and calls

  — 

Transfers into level 3

  — 

Transfers out of level 3

  — 

Balance at March 31, 2020

 $16,873 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

Estimated

       
  

Fair Value

  

Valuation Technique

 

Unobservable Inputs

 

Range of Discounts

March 31, 2021

          

Obligations of State and Political Subdivisions

 $17,949  

Option-adjusted discounted cash flow model; present value of expected future cash flow model

 

Bond Appraisal Adjustment(1)

 

0%

           
December 31, 2020          
Obligations of State and Political Subdivisions $18,516  Option-adjusted discounted cash flow model; present value of expected future cash flow model Bond Appraisal Adjustment(1) 0% - 0.4%
  

Estimated

        

Weighted Average

  

Fair Value

  

Valuation Technique

 

Unobservable Inputs

 

Range of Discounts

 

Discount

March 31, 2021

            
Impaired loans $1,146  Discounted cash flows, Underlying collateral value Collateral discounts and estimated costs to sell 5% - 13% 13%
             

December 31, 2020

            

Impaired loans

 $259  

Discounted cash flows, Underlying collateral value

 

Collateral discounts and estimated costs to sell

 

2% - 100%

 

34%

Other real estate owned

  635  

Underlying collateral value, Third party appraisals

 

Collateral discounts and discount rates

 

4%

 

4%
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

March 31, 2021

 
  

Carrying

  

Estimated

             
  

Amount

  

Fair Value

  

Level 1

  

Level 2

  

Level 3

 

Financial assets:

                    

Cash and due from banks

 $99,370  $99,370  $99,370  $—  $— 
Federal funds sold  97   97   97   —   — 

Investment securities

  313,399   313,774   —   287,502   26,272 

Equity securities

  16,763   16,763   1,800   14,963   — 

Loans, net of allowance

  1,825,547   1,848,567   —   1,848,567   — 

Derivative financial instruments

  5,461   5,461   —   5,461   — 
                     

Financial liabilities:

                    

Deposits, noninterest-bearing

 $515,487  $515,487  $—  $515,487  $— 

Deposits, interest-bearing

  1,494,393   1,520,587   —   —   1,520,587 

FHLB short-term advances and repurchase agreements

  8,274   8,274   —   8,274   — 

FHLB long-term advances

  78,500   78,353   —   —   78,353 

Junior subordinated debt

  5,962   2,556   —   —   2,556 

Subordinated debt

  43,600   39,937   —   39,937   — 
  

December 31, 2020

 
  

Carrying

  

Estimated

             
  

Amount

  

Fair Value

  

Level 1

  

Level 2

  

Level 3

 

Financial assets:

                    

Cash and due from banks

 $35,368  $35,368  $35,368  $—  $— 

Investment securities

  280,844   281,059   —   254,306   26,753 

Equity securities

  16,599   16,599   1,670   14,929   — 

Loans, net of allowance

  1,839,955   1,861,971   —   —   1,861,971 
                     

Financial liabilities:

                    

Deposits, noninterest-bearing

 $448,230  $448,230  $—  $448,230  $— 

Deposits, interest-bearing

  1,439,594   1,504,644   —   —   1,504,644 

FHLB short-term advances and repurchase agreements

  47,653   47,653   —   47,653   — 

FHLB long-term advances

  78,500   82,101   —   —   82,101 

Junior subordinated debt

  5,949   5,299   —   —   5,299 

Subordinated debt

  43,600   42,336   —   42,336   — 

Derivative financial instruments

  2,216   2,216   —   2,216   —