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Note 12 - Commitments and Off-balance-sheet Risk (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Summary of Contractual Amounts of Financial Instruments With Off Balance Sheet Risk [Table Text Block]

(Dollars in thousands)

 2023  2022 
         

Commercial unused lines of credit

 $1,557,429  $1,283,703 

Unused lines of credit secured by 1 – 4 family residential properties

  74,120   71,972 

Credit card unused lines of credit

  142,096   123,687 

Other consumer unused lines of credit

  50,063   75,747 

Commitments to make loans

  270,403   329,646 

Standby letters of credit

  19,393   23,539 
         

Total commitments

 $2,113,504  $1,908,294 
Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block]

(Dollars in thousands)

 December 31, 2023  December 31, 2022 
  

Contract

  

Carrying

  

Contract

  

Carrying

 
  

Amount

  

Value

  

Amount

  

Value

 
                 

Standby letters of credit

 $19,393  $99  $23,539  $108