left join not giving correct output

I am having 2 table

tableA

Accountid   
-----------  
10  
11  
12  

tableB

Accountid   |   Date        |   
--------------------------------------------    
10      |   2016-02-02  |   
11      |   2016-02-02  |   
11      |   2016-02-02  |    
15      |   2016-02-03  |   

I am expecting the output like

Accountid   |   ID  |   
------------------------------------    
10      |   10  |   
11      |   11  |   
12      |   NULL    |   

I am running this query

select A.accountid,b.accountid as ID 
from tableA as A 
left join tableB as B on a.accountid=b.accountid 
where b.date between '2016-02-02' and '2016-02-02'

but it is giving me the output as, I am not sure where am I going wrong

Accountid   |   ID  |   
----------------------------------- 
10      |   10  |   
11      |   11  |   

I am using MSSQL database.