A Dubuque-based financial institution plans to acquire a Texas-based bank holding company in a $280 million deal.

Heartland Financial USA and AIM Bancshares announced Thursday that they had entered into a definitive merger agreement. Heartland will acquire ABI and its wholly owned subsidiary, AimBank.

Headquartered in Levelland, Texas, AimBank is a full-service community bank with about $1.8 billion in assets, according to a press release.

The deal marks Heartland’s 17th acquisition since 2012 and will expand its presence in west Texas.

AimBank will merge with and into Heartland’s existing Lubbock, Texas-based subsidiary, FirstBank & Trust. The union of AimBank and FirstBank & Trust will create Heartland’s largest bank subsidiary.

The completion of the ABI acquisition will push Heartland’s assets to about $15 billion and its number of full-service banking locations to 140 in 12 states.