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Note 8 - Commitments and Off-balance Sheet Risk (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Summary of Contractual Amounts of Financial Instruments With Off Balance Sheet Risk [Table Text Block]
   
September
30,
201
7
   
December 31,
201
6
 
                 
Commercial unused lines of credit
  $
687,396,000
    $
553,345,000
 
Unused lines of credit secured by 1
– 4 family residential properties
   
60,564,000
     
56,275,000
 
Credit card unused lines of credit
   
37,258,000
     
22,689,000
 
Other consumer unused lines of credit
   
15,575,000
     
8,489,000
 
Commitments to make loans
   
130,455,000
     
154,338,000
 
Standby letters of credit
   
26,956,000
     
26,202,000
 
    $
958,204,000
    $
821,338,000