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Note 6 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 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 - September 30, 2022

                

Equity securities

 $6,116  $-  $1,861  $7,977 
                 

Investment Securities, Available for Sale - September 30, 2022

                

U. S. Treasury notes and bonds

 $-  $77,554  $-  $77,554 

State and municipal

  -   223,987   -   223,987 

Mortgage-backed

  -   214,691   -   214,691 

Corporate

  -   716   -   716 

Asset-backed securities

  -   13,145   -   13,145 

Total

 $-  $530,093  $-  $530,093 
                 

Derivative Instruments - September 30, 2022

                

Interest rate derivative contracts - assets

 $-  $28,185  $-  $28,185 

Interest rate derivative contracts - liabilities

 $-  $5,524  $-  $5,524 
                 

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]
  

Nine Months Ended

 

(Dollars in thousands)

 

September 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

  18   (51)

Net purchases, sales, calls, and maturities

  75   262 

Net transfers into Level 3

  -   - 

Balance, September 30,

 $1,861  $1,696 
         

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 September 30,

 $18  $(51)
         

Investment Securities, Available for Sale

        

Balance, January 1

 $21,050  $11,423 

Total unrealized gains included in other comprehensive income

  -   (369)

Net purchases, sales, calls, and maturities

  -   7,979 

Net transfers into Level 3

  -   - 

Transfer to held to maturity

  (21,050)  - 

Balance, September 30,

 $-  $19,033 
         

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 September 30,

 $-  $(366)
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

                

September 30, 2022

 $2,637  $-  $-  $2,637 

December 31, 2021

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

Other Real Estate

                

September 30, 2022

 $-  $-  $-  $- 

December 31, 2021

 $194  $-  $-  $194 
                 

Mortgage Loan Servicing Rights

                

September 30, 2022

 $4,537  $-  $4,537  $- 

December 31, 2021

 $4,666  $-  $4,666  $-