Yes it is 100% scam.
How it works:
You met someone online. As a sign of trust, he shares with you his login details for his bank account. After you see his account on this fake website, he asks for your help to recover a payment allegedly received from one of his contractors. He may show you his bogus bank account before asking for money, and you see his bank account because he want to prove you he has enough resources the repay the amount he is asking for.
The bank is fake. His bank account on that bank is fake as well. He is fake. The picture he uses is stolen. The name and the identity he uses are fake.
The only real part is the money you will lose while trying to help him.
According to their fake website, they shows being active "Since 1990".
COASTRA CREDIT UNION has the solutions that can help you meet the many challenges of managing your business in today’s fast paced environment. we offer the professional commercial services you’ve come to expect from a big bank, while maintaining the convenience and service that only a community bank can provide. Most important, our top priority is to understand your business and financial needs..
Same address was previously shared with other fake banks: lloyds-onlineservice.com - impersonating Lloyds, e-piraeusonline.com - impersonating Piraeus Bank and kruzkonline.com - impersonating Kruzk Bank.
Entry in the aa419 Database of fraudulent websites: https://db.aa419.org/fakebanksview.php?key=140548
From the domain name registation:
Domain name: coastraunion.com
Updated Date: 2019-02-21 Creation Date: 2019-02-21
Registrar Registration Expiration Date: 2020-02-21
Registrar: NAMECHEAP INC
Reseller: NAMECHEAP INC
Registry Registrant ID:
Registrant Name: CAMPBELL HEATHER
Registrant Street: 130 W FORTUNE ST VIRDEN,IL 62690
Registrant City: SPRINGFIELD
Registrant State/Province: IL
Registrant Postal Code: 62690
Registrant Country: US
Registrant Phone: +1.7576564455
Registrant Email: email@example.com
This is what the fake website looks like: