The proposed $3.6 billion merger between Chemical Financial Corp. and TCF Financial Corp. would create a Midwest bank based in Michigan that’s able to compete with the largest national banks and that’s likely to pursue further acquisitions. Under the $3.6 billion all-stock deal, the Wayzata, Minn.-based TCF Financial (NYSE: TCF) would merge into the Detroit-based Chemical Financial (Nasdaq: CHFC). Once the deal closes, Chemical Bank locations would take on the TCF name.