Author Bio Bram Berkowitz mainly writes in the financials bureau covering the banking sector. Prior to The Motley Fool, he wrote about and covered community and regional banks in New England for The Warren Group. Follow @BramBerko When the $43 billion asset Western Alliance Bancorporation (NYSE:WAL) announced that it would purchase the mortgage company AmeriHome Mortgage, some investors might have been surprised, given Western Alliance's dominance in the commercial and industrial (C&I) lending space. After all, if it's not broke, why fix it? And in this case, if it's an industry leader, why fix it? But since the deal got announced in February, it is already looking like Western Alliance made the right decision. Here's why.