Dreamweaver is indeed powerful and in the hands of a pro can cut time and money. But take note...I said "in the hands of a pro". Meaning you will only achieve the promise of ease and speed when you know how to manipulate the program. Output is only as good as the input
If your company wants to do in-house web development, it's a good idea to invest in Adobe's Web Premium suite (Dw, Ps, Fl, Ai , Fw). I would not buy dreamweaver as a stand alone program...just do the math. Besides as everybody had already pointed out, there are a lot of free, open source programs out there that would fit the bill. I can live without DW but because I have it (I bought the entire suite) I use it. Otherwise, I can be equally capable with just a text editor (notepad++ is great) and the Firebug and Web Development Toolbar add-ons to Firefox (a must if you're a web developer). Best of all they're free.
And finally...a bank's web interface(?) is something you won't want to play around with...so I'd hire a pro.