State banking regulators are stepping up their attack on a tactic used by national banks for expanding across state lines.

The banking commissioner of Michigan is protesting KeyCorp's use of the "30-mile rule" to move a Michigan unit to Indiana. And Oklahoma's banking chief is threatening to sue over plans by a small bank in that state to jump into Texas using the rule.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.