Buchanan Ingersoll and Klett Rooney Lieber & Schorling have become one after a shareholder vote at both firms Tuesday morning gave the merger the go-ahead.

The new firm, Buchanan Ingersoll & Rooney, will become the largest law firm in Pennsylvania — in terms of number of attorneys in the state — with roughly 313 lawyers according to the last survey conducted by PaLaw. As a whole, the firm will have more than 525 attorneys nationwide.