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Note 8 - Commitments and Off-balance Sheet Risk (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Summary of Contractual Amounts of Financial Instruments With Off Balance Sheet Risk [Table Text Block]
  

June 30,

2020

  

December 31,

2019

 
         

Commercial unused lines of credit

 $862,725,000  $776,493,000 

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

  60,196,000   60,858,000 

Credit card unused lines of credit

  63,951,000   58,199,000 

Other consumer unused lines of credit

  23,080,000   18,135,000 

Commitments to make loans

  175,951,000   101,961,000 

Standby letters of credit

  21,427,000   22,798,000 
  $1,207,330,000  $1,038,444,000