Chase requires Java to see pending Checks for business banking w/ fraud protection which lets you OK or reject checks before they're detected from your account.
Whereas they have scanned JPEGs for account history check images, the pending fraud control check images require Java.
I am willing to wager your credit union is not paying you 3.5% APY on your checking account. That is, if you had $10,000 in your checking account at the end of the year, and you just left it there, you would not have $10,375 at the end of year.
There is a restriction/surcharge in there that you haven't mentioned.
I wish I could re-finance my mortgage at 3.375% fixed. :(
This is why I don't understand why people keep going back to banks and getting screwed every single time. The bank is there to make money off its customers; the credit union, by definition, is there to make money for its customers.
https://www.kemba.com/checking-savings/checking/get-green-ch...
We are typically asked to write checks by lawyers :) Everyone else has moved to electronic banking.
Checks are also handy for one-off payments to people (not companies!) you don't know and won't meet again.