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Note 10 - Federal Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

2020

  

2019

  

2018

 
             

Current expense

 $14,945,000  $10,978,000  $10,170,000 

Deferred expense

  (4,141,000

)

  26,000   (372,000

)

Change in valuation allowance

  (94,000

)

  0   0 

Tax expense

 $10,710,000  $11,004,000  $9,798,000 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

2020

  

2019

  

2018

 
             

Tax at statutory rate

 $11,518,000  $12,697,000  $10,883,000 

Increase (decrease) from

            

Tax-exempt interest

  (681,000

)

  (644,000

)

  (620,000

)

Bank owned life insurance

  (238,000

)

  (804,000

)

  (201,000

)

Change in valuation allowance

  (94,000

)

  0   0 

Other

  205,000   (245,000

)

  (264,000

)

Tax expense

 $10,710,000  $11,004,000  $9,798,000 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

2020

  

2019

 

Deferred income tax assets

        

Allowance for loan losses

 $7,973,000  $5,017,000 

Deferred compensation

  511,000   577,000 

Stock compensation

  541,000   720,000 

Nonaccrual loan interest income

  211,000   239,000 

Deferred loan fees

  924,000   104,000 

Capital loss carryforward

  0   94,000 

Fair value write-downs on foreclosed properties

  537,000   26,000 

Other

  938,000   683,000 

Deferred tax asset before valuation allowance

  11,635,000   7,460,000 

Valuation allowance

  0   (94,000

)

Deferred tax asset after valuation allowance

  11,635,000   7,366,000 
         

Deferred income tax liabilities

        

Depreciation

  1,175,000   1,743,000 

Prepaid expenses

  297,000   269,000 

Core deposit intangible

  498,000   787,000 

Mortgage loan servicing rights

  1,720,000   977,000 

Unrealized gain on securities

  1,458,000   982,000 

Business combination adjustments

  2,142,000   2,058,000 

Other

  521,000   485,000 

Deferred tax liability

  7,811,000   7,301,000 
         

Total net deferred tax asset

 $3,824,000  $65,000