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Note 9 - Federal Income Taxes (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

(Dollars in thousands)

 2023  2022  2021 
             

Current expense

 $22,518  $16,080  $12,675 

Deferred (benefit) expense

  (2,036)  (1,353)  2,020 

Tax expense

 $20,482  $14,727  $14,695 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

(Dollars in thousands)

 2023  2022  2021 
             

Tax at statutory rate

 $21,567  $15,915  $15,481 

Increase (decrease) from

            

Tax-exempt interest

  (862)  (695)  (658)

Bank owned life insurance

  (303)  (334)  (233)

Other

  80   (159)  105 

Tax expense

 $20,482  $14,727  $14,695 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

(Dollars in thousands)

 2023  2022 

Deferred income tax assets

        

Allowance for credit losses

 $10,482  $8,872 

Deferred compensation

  226   232 

Stock compensation

  1,005   1,018 

Nonaccrual loan interest income

  132   136 

Unrealized loss on securities

  13,420   17,369 

Lease liability

  775   810 

Other

  779   494 

Deferred tax asset

  26,819   28,931 
         

Deferred income tax liabilities

        

Depreciation

  337   697 

Prepaid expenses

  612   504 

Core deposit intangible

  0   120 

Mortgage loan servicing rights

  2,382   2,486 

Deferred loan fees and costs

  509   211 

Right of use lease asset

  775   810 

Business combination adjustments

  1,770   1,877 

Other

  447   326 

Deferred tax liability

  6,832   7,031 
         

Total net deferred tax asset

 $19,987  $21,900