Not often, no. What’s banking in this context mean for you? I’m assuming viewing accounts and depositing checks?

Exclusively, yes. Except for that second factor authentication they forced me to install on my phone (without which doing online payments would be a pain). I like and trust my Ubuntu laptop.

I do avoid Windows for those things, though.

Do banks have mobile check deposit on a laptop? I don't think mine does.

Nerd here who started on MS-DOS and later spent nearly a decade running Linux on a laptop as my main computing device. Gentoo, for about half that time. Various other stuff in between, developed software targeting probably a seven or eight different operating systems and/or platforms, et c., et c. I've got a reasonable amount of computer-dork cred, is the point, though around these parts, nothing all that remarkable.

Very nearly every halfway serious computer-involved activity I do these days (=last seven or eight years) that matters in my actual, real life takes place on my phone, including approximately all banking. All the other computers—even the "real" ones—in my life are basically toys. 90% of my real-life important or meaningful stuff I do with computers happens on my phone, 9% on a tablet, and at-most 1% on everything else.

(in my personal life, I mean—unfortunately I still have to try to use "real" computers to accomplish allegedly-important things at work)