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Note 10 - Federal Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

2021

  

2020

  

2019

 
             

Current expense

 $12,675,000  $14,945,000  $10,978,000 

Deferred expense

  2,020,000   (4,141,000

)

  26,000 

Change in valuation allowance

  0   (94,000

)

  0 

Tax expense

 $14,695,000  $10,710,000  $11,004,000 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

2021

  

2020

  

2019

 
             

Tax at statutory rate

 $15,481,000  $11,518,000  $12,697,000 

Increase (decrease) from

            

Tax-exempt interest

  (658,000

)

  (681,000

)

  (644,000

)

Bank owned life insurance

  (233,000

)

  (238,000

)

  (804,000

)

Change in valuation allowance

  0   (94,000

)

  0 

Other

  105,000   205,000   (245,000

)

Tax expense

 $14,695,000  $10,710,000  $11,004,000 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

2021

  

2020

 

Deferred income tax assets

        

Allowance for loan losses

 $7,426,000  $7,973,000 

Deferred compensation

  259,000   511,000 

Stock compensation

  941,000   541,000 

Nonaccrual loan interest income

  159,000   211,000 

Deferred loan fees

  520,000   924,000 

Unrealized loss on securities

  991,000   0 

Fair value write-downs on foreclosed properties

  0   537,000 

Other

  1,344,000   938,000 

Deferred tax asset

  11,640,000   11,635,000 
         

Deferred income tax liabilities

        

Depreciation

  1,168,000   1,175,000 

Prepaid expenses

  416,000   297,000 

Core deposit intangible

  276,000   498,000 

Mortgage loan servicing rights

  2,572,000   1,720,000 

Unrealized gain on securities

  0   1,458,000 

Business combination adjustments

  2,013,000   2,142,000 

Other

  942,000   521,000 

Deferred tax liability

  7,387,000   7,811,000 
         

Total net deferred tax asset

 $4,253,000  $3,824,000