Below are the details from the TCF Bank  site:

To show our appreciation to our valued customers, we’re upping our Tell-A-Friend referral bonus from $25 to $50 Cash1. Hurry! This offer is only available this weekend . . . so tell all your friends today!

Plus, when your friend opens their qualifying TCF Checking account and makes qualifying transactions they’ll get $50 FREE2!

Get started now with 3 easy steps!

1. Print your Tell-A-Friend form or pick one up at your neighborhood TCF Bank location.

2. Give it to a friend and recommend a new TCF Checking account.

3. When your friends open a new TCF account this weekend, October 22-24, 2010, we will credit your account $50!

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Certain restrictions may apply. These are limited time offers. TCF reserves the right to discontinue these offers at any time. See a TCF Representative for details. 1Offer valid for referred accounts opened October 22-24, 2010. A Tell-A-Friend form must be submitted to a TCF Branch at account opening. Referred customer must not have had a TCF Checking account in the past 90 days. Referring customer’s TCF account must be in good standing. Cash will be credited into the referring customer’s account within 4 weeks. Referring customer is responsible for all applicable taxes. 2Offer applies to TCF non-interest bearing checking accounts. The account must have a total of 10 qualifying transactions posted to the account within 60 calendar days of account opening. Qualifying transactions include check card purchases posted and checks cleared within 60 calendar days of account opening. Cash will be credited the next Business Day following the date by which all transactions are posted. Offer is available to individuals and small businesses without a TCF Checking account in the past 90 days. Campus card student account customers receive the applicable campus program gift in lieu of $50 cash. Minimum $25 to open a personal non-interest bearing checking account and $100 for a business non-interest bearing checking account. Recipient is responsible for all applicable taxes.