Family Visitor visa sponsorship

Hi,
My parents are planning to visit me in the UK. I have an ILR here and Im also planning to sponsor my parents visit to the UK. As a sponsor, I think I will have to submit my 6 months payslips. dividend letter from accountant and also my 6 months Bank statements. Although I do have the 6 months bank statement ready, I had not saved much for the first 3 months(balance of around £600 only). I have made sure that I have saved more than £2500 for the last 3 months. Is this sufficient to show as maintenance funds for both of my parents? Please note that, apart from the maintenance funds, I have already booked and paid for, my parents return tickets.

So will the Home Office expect me to set the funds aside for more than 3 months?
Im submitting council tax bill and rental agreement for proof of accommodation. Hope that's sufficient.
Please do let me know.

Thanks in advance.

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