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It'll be less secure.
If they hash a subset, then those extra characters are literally irrelevant, since the hash algorithm will exclude them. Like if they just hashed the first 5 characters, then "passw" is the same as "password" and all those permutations. Hashing is safe because it's one-way, but simple testing on the hashing algorithm would reveal certain characters don't matter.
Protecting a smaller subset of characters in addition to the whole password is slightly better but still awful. Cracking the smaller subset will be significantly easier using rainbow tables, and literally gives a hint for the whole password, making a rainbow table attack significantly more efficient. Protecting the whole thing (with no easy hints) is way more secure.
It also adds nothing to keylogging, since it's not even a new code, it's part of the password.
There was a time where that level of security was acceptable, and it still could be ok on a closed system like an ATM, as the other reply to my comment pointed out, but this kind of protection on a standard computer is outdated and adds holes.
Less secure if you come at it from the perspective of cracking the password, but probably more secure in real-world terms.
If you type in your bank password and somebody's compromised your browser, they now have your entire password.
If you type in the third, fourth and eighth digits and somebody's compromised your browser, they still can't access your account.
Obviously full 2FA is probably better, but
If it's too hard for certain users to engage with the system correctly, they'll try to sneak around it in ways that could compromise their security more than if the bank had just gone with the specific digits thing in the first place.