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Note 20 - Financial Instruments with Off-Balance Sheet Risk (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
(dollars in thousands)
 
2016
   
2015
 
Unfunded loan commitments
  $
2,225,995
    $
1,891,934
 
Unfunded lines of credit
   
94,375
     
112,159
 
Letters of credit
   
72,084
     
83,511
 
Total
  $
2,392,454
    $
2,087,604