Verification of funds within 5 days - bank statement ok?

[Peter Sik]

I am in contract of purchasing a property in Montgomery AL. According to the contract, I need to  provide "Verification of funds within 5 days". Listing agent is asking for bank letterhead for that. But the thing is there is no CHASE bank in Montgomery, the closest one is like 2 hours driving for only one way. So, I said I am willing to provide my bank statement to fulfill that "Verification of funds within 5 days". But they said no, I need to ask my bank to get the bank letterhead letter. 

I want to ask people here is it my bank statement is consider "Verification of funds"? For me, sure it is. Just want to hear more opinion. Thanks