Just like for any other document, when you import an order it will be in status Draft (a draft order is a quotation). There is no way to import a document in a different status than the first one (ie. draft).

If you use Odoo Ecommerce for your online shop, the quotation would be converted to a sale order even if it was meant to be paid by wire because Odoo would know that the sale was made. Indeed in Odoo Ecommerce, a cart is a quotation and going through the checkout transforms it in a sale order (even with wire transfer payment).

Because you use a different software than Odoo to sell online, Odoo cannot possibly know that the sale was made, so nothing is going to convert the quotation into a sale order and this has to be done manually.

You only have 2 options to make this automatic: 1) you use Odoo Ecommerce instead of another software application, or 2) you develop a script that create a quotation and converts it into a sale order when a sale is made in your online shop.