Has the banks security interest attached? If so, when?

Interpret the law of secured transactions.

You are the chief executive officer of Money Games Inc.(MGI), which has begun to market Borrow & Spend, a video game set in the world of finance. To buy ads, MGI borrows $50,000 from First Savings Bank. On MGI's behalf, you sign a note for the loan and offer its accounts receivable as collateral. You sign a security agreement that describes the collateral. The bank does not file a financing statement.

Has the banks security interest attached?
If so, when?

An essay containing a minimum of 200 words.

Reference

Hollowell, W.E. & Miller, R. L., (2014).  Business law text & exercises. (7th ed.) South-Western, Cengage Learning.